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Question Number 44424 Answers: 1 Comments: 0

by considering a sermicircle from −r to r prove that area of circle is πr^2

$${by}\:{considering}\:\:{a}\:{sermicircle}\:{from}\:−{r}\:{to}\:\:{r}\:{prove}\:{that}\:{area}\:{of}\:{circle}\:{is}\:\pi{r}^{\mathrm{2}} \\ $$

Question Number 44423 Answers: 1 Comments: 0

evaluate ∫3^x dx

$${evaluate}\:\int\mathrm{3}^{{x}} {dx} \\ $$

Question Number 44422 Answers: 0 Comments: 3

use substitution x=cos^2 θ+3sin^2 θ show that∫_1 ^3 (dx/(√((x−1)(3−x))))=π

$${use}\:{substitution}\:{x}=\mathrm{cos}\:^{\mathrm{2}} \theta+\mathrm{3}{sin}^{\mathrm{2}} \theta \\ $$$${show}\:{that}\int_{\mathrm{1}} ^{\mathrm{3}} \frac{{dx}}{\sqrt{\left({x}−\mathrm{1}\right)\left(\mathrm{3}−{x}\right)}}=\pi \\ $$

Question Number 44411 Answers: 0 Comments: 0

Question Number 44397 Answers: 2 Comments: 4

If x is nearly equal to 1 then ((mx^m −nx^n )/(m−n))=

$${If}\:{x}\:{is}\:{nearly}\:{equal}\:{to}\:\mathrm{1}\:{then} \\ $$$$\frac{{mx}^{{m}} −{nx}^{{n}} }{{m}−{n}}= \\ $$

Question Number 44395 Answers: 1 Comments: 3

Question Number 44389 Answers: 0 Comments: 0

Given 2 events A and B such that P(A)=(1/3) , P(A∪B)=(3/4) then find range of P(B)?

$${Given}\:\mathrm{2}\:{events}\:{A}\:{and}\:{B}\:{such}\:{that} \\ $$$${P}\left({A}\right)=\frac{\mathrm{1}}{\mathrm{3}}\:,\:{P}\left({A}\cup{B}\right)=\frac{\mathrm{3}}{\mathrm{4}}\:{then} \\ $$$${find}\:{range}\:{of}\:{P}\left({B}\right)? \\ $$

Question Number 44387 Answers: 0 Comments: 0

Question Number 44384 Answers: 2 Comments: 6

Let a and b are real numbers such that a > b > 0 Find the minimum value of (√2)a^3 + (3/(ab − b^2 ))

$$\mathrm{Let}\:{a}\:\mathrm{and}\:{b}\:\mathrm{are}\:\mathrm{real}\:\mathrm{numbers}\:\mathrm{such}\:\mathrm{that} \\ $$$${a}\:>\:{b}\:>\:\mathrm{0} \\ $$$$\mathrm{Find}\:\mathrm{the}\:\mathrm{minimum}\:\mathrm{value}\:\mathrm{of} \\ $$$$\sqrt{\mathrm{2}}{a}^{\mathrm{3}} \:+\:\frac{\mathrm{3}}{{ab}\:−\:{b}^{\mathrm{2}} } \\ $$

Question Number 44374 Answers: 1 Comments: 0

Question Number 44373 Answers: 1 Comments: 0

Question Number 44369 Answers: 1 Comments: 1

The domain of f(x)=(√(cos(sinx))) +(1−x)^(−1) + sin^(−1) ((x^2 +1)/(2x)) is.........=.

$${The}\:{domain}\:{of}\: \\ $$$${f}\left({x}\right)=\sqrt{{cos}\left({sinx}\right)}\:+\left(\mathrm{1}−{x}\overset{−\mathrm{1}} {\right)}+\:\mathrm{sin}^{−\mathrm{1}} \frac{{x}^{\mathrm{2}} +\mathrm{1}}{\mathrm{2}{x}} \\ $$$${is}.........=. \\ $$

Question Number 44365 Answers: 2 Comments: 1

Question Number 44356 Answers: 0 Comments: 0

Question Number 44355 Answers: 0 Comments: 0

Question Number 44351 Answers: 1 Comments: 1

If is an even function defined on the interval (−5,5) then a value of x satisfying the equation f(x)=f(((x+1)/(x+2))) is a)((−1+(√5))/2) b)((−3+(√5))/2) c)((−1−(√5))/2) d)((−3−(√5))/2_ )

$${If}\:{is}\:{an}\:{even}\:{function}\:{defined}\:{on} \\ $$$${the}\:{interval}\:\left(−\mathrm{5},\mathrm{5}\right)\:{then}\:{a}\:{value} \\ $$$${of}\:{x}\:{satisfying}\:{the}\:{equation} \\ $$$${f}\left({x}\right)={f}\left(\frac{{x}+\mathrm{1}}{{x}+\mathrm{2}}\right)\:{is} \\ $$$$\left.{a}\left.\right)\left.\frac{−\mathrm{1}+\sqrt{\mathrm{5}}}{\mathrm{2}}\:{b}\right)\frac{−\mathrm{3}+\sqrt{\mathrm{5}}}{\mathrm{2}}\:{c}\right)\frac{−\mathrm{1}−\sqrt{\mathrm{5}}}{\mathrm{2}}\: \\ $$$$\left.{d}\right)\frac{−\mathrm{3}−\sqrt{\mathrm{5}}}{\mathrm{2}_{} } \\ $$

Question Number 44350 Answers: 0 Comments: 3

If f(x+y)=f(x).f(y) for real x,y and f(0)≠0.Let F(x)=((f(x))/(1+(f(x))^2 )) then F(x) is a)even b)odd c)neither even nor odd

$${If}\:{f}\left({x}+{y}\right)={f}\left({x}\right).{f}\left({y}\right)\:{for}\:{real}\:{x},{y} \\ $$$${and}\:{f}\left(\mathrm{0}\right)\neq\mathrm{0}.{Let}\:{F}\left({x}\right)=\frac{{f}\left({x}\right)}{\mathrm{1}+\left({f}\left({x}\right)\right)^{\mathrm{2}} } \\ $$$${then}\:{F}\left({x}\right)\:{is} \\ $$$$\left.{a}\left.\right)\left.{even}\:{b}\right){odd}\:{c}\right){neither}\:{even}\:{nor}\:{odd} \\ $$

Question Number 44346 Answers: 0 Comments: 0

Question Number 44336 Answers: 0 Comments: 0

Question Number 44334 Answers: 1 Comments: 0

Question Number 44333 Answers: 0 Comments: 2

Can positive integers a, b, c be found such that a^3 + b^3 = c^(3 ) ?

$$\mathrm{Can}\:\mathrm{positive}\:\mathrm{integers}\:\:\mathrm{a},\:\mathrm{b},\:\mathrm{c}\:\:\mathrm{be}\:\mathrm{found}\:\mathrm{such}\:\mathrm{that}\:\:\:\mathrm{a}^{\mathrm{3}} \:+\:\mathrm{b}^{\mathrm{3}} \:=\:\mathrm{c}^{\mathrm{3}\:\:\:} ? \\ $$

Question Number 44325 Answers: 0 Comments: 1

Question Number 44324 Answers: 2 Comments: 0

5 2 a + 3 5 ___ the addition on the left is in base 6.find a. 1001

$$\:\:\:\:\:\:\:\:\:\mathrm{5}\:\mathrm{2}\:{a} \\ $$$$\:\:\:\:+\:\:\:\:\mathrm{3}\:\:\mathrm{5} \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\_\_\_\:\:\:\:\:{the}\:{addition}\:{on}\:{the}\:{left}\:{is}\:{in}\:{base}\:\mathrm{6}.{find}\:{a}. \\ $$$$\:\:\:\:\:\:\:\:\mathrm{1001} \\ $$

Question Number 44319 Answers: 1 Comments: 2

find lim_(x→0^+ ) ∫_x ^(2x) ((√(1+t^2 ))/t)dt .

$${find}\:{lim}_{{x}\rightarrow\mathrm{0}^{+} } \:\:\:\int_{{x}} ^{\mathrm{2}{x}} \:\frac{\sqrt{\mathrm{1}+{t}^{\mathrm{2}} }}{{t}}{dt}\:. \\ $$

Question Number 44318 Answers: 1 Comments: 2

let f(x)=∫_x ^(+∞) (e^(−t) /t)dt 1)calculate f^′ (x) 2)find a equivalent of f(x) when x→+∞.

$${let}\:{f}\left({x}\right)=\int_{{x}} ^{+\infty} \:\frac{{e}^{−{t}} }{{t}}{dt} \\ $$$$\left.\mathrm{1}\right){calculate}\:{f}^{'} \left({x}\right) \\ $$$$\left.\mathrm{2}\right){find}\:{a}\:{equivalent}\:{of}\:{f}\left({x}\right)\:{when} \\ $$$${x}\rightarrow+\infty. \\ $$

Question Number 44315 Answers: 1 Comments: 0

If the sum of the coefficients in the expansion of (1+2x)^n is 6561, then the greatest coefficient in the expansion is

$$\mathrm{If}\:\mathrm{the}\:\mathrm{sum}\:\mathrm{of}\:\mathrm{the}\:\mathrm{coefficients}\:\mathrm{in}\:\mathrm{the} \\ $$$$\mathrm{expansion}\:\mathrm{of}\:\left(\mathrm{1}+\mathrm{2}{x}\right)^{{n}} \:\mathrm{is}\:\mathrm{6561},\:\mathrm{then}\:\mathrm{the} \\ $$$$\mathrm{greatest}\:\mathrm{coefficient}\:\mathrm{in}\:\mathrm{the}\:\mathrm{expansion}\:\mathrm{is} \\ $$

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