Question and Answers Forum

(1)lim_(x→0) ((1−cos^6 (2x)cos^3 (3x))/(3x^2 )) ? (2)lim_(x→0) ((1−cos 4x+2sin^2 x.cos 4x)/(x^2 .cos 3x))? (3) lim_(x→(π/2)) ((sin x−2cos^2 x−1)/( (√(sin^3 x))−(√(sin x)))) ?

$$\left(\mathrm{1}\right)\underset{{x}\rightarrow\mathrm{0}} {\mathrm{lim}}\:\frac{\mathrm{1}−\mathrm{cos}\:^{\mathrm{6}} \left(\mathrm{2}{x}\right)\mathrm{cos}\:^{\mathrm{3}} \left(\mathrm{3}{x}\right)}{\mathrm{3}{x}^{\mathrm{2}} }\:? \\ $$$$\left(\mathrm{2}\right)\underset{{x}\rightarrow\mathrm{0}} {\mathrm{lim}}\frac{\mathrm{1}−\mathrm{cos}\:\mathrm{4}{x}+\mathrm{2sin}\:^{\mathrm{2}} {x}.\mathrm{cos}\:\mathrm{4}{x}}{{x}^{\mathrm{2}} .\mathrm{cos}\:\mathrm{3}{x}}? \\ $$$$\left(\mathrm{3}\right)\:\underset{{x}\rightarrow\frac{\pi}{\mathrm{2}}} {\mathrm{lim}}\:\frac{\mathrm{sin}\:{x}−\mathrm{2cos}\:^{\mathrm{2}} {x}−\mathrm{1}}{\:\sqrt{\mathrm{sin}\:^{\mathrm{3}} {x}}−\sqrt{\mathrm{sin}\:{x}}}\:?\: \\ $$

Question Number 115318 Answers: 2 Comments: 0

lim_(x→0) ((xsin x)/(2sin^2 (3x)−x^2 cos x))

$$\:\underset{{x}\rightarrow\mathrm{0}} {\mathrm{lim}}\:\frac{{x}\mathrm{sin}\:{x}}{\mathrm{2sin}\:^{\mathrm{2}} \left(\mathrm{3}{x}\right)−{x}^{\mathrm{2}} \mathrm{cos}\:{x}} \\ $$

Question Number 115312 Answers: 3 Comments: 2

Solve for x ∈ R that suitable on this inequality : (√(8−x^2 )) > x

$${Solve}\:\:{for}\:\:{x}\:\in\:\mathbb{R}\:\:{that}\:\:{suitable}\:\:{on}\:\:{this} \\ $$$${inequality}\::\:\:\:\:\sqrt{\mathrm{8}−{x}^{\mathrm{2}} }\:\:>\:\:{x} \\ $$

Question Number 115302 Answers: 1 Comments: 0

... nice math... find lim_(n→∞ ) {Σ_(k=1) ^n ∫_(k−1) ^( k) tan^(−1) (((nx−nk)/(kx+n^2 )))dx}

$$\:\:\:\:\:\:\:...\:{nice}\:\:{math}... \\ $$$$\:\:\:\:\:{find} \\ $$$$\:\:\:\:{lim}_{{n}\rightarrow\infty\:\:} \left\{\underset{{k}=\mathrm{1}} {\overset{{n}} {\sum}}\int_{{k}−\mathrm{1}} ^{\:\:{k}} {tan}^{−\mathrm{1}} \left(\frac{{nx}−{nk}}{{kx}+{n}^{\mathrm{2}} }\right){dx}\right\} \\ $$$$\: \\ $$

Question Number 115301 Answers: 2 Comments: 0

if jx^2 +2kxy+by^2 =1 show that (kx+by)^3 (d^2 y/dx^2 )=k^2 −jb

$${if}\: \\ $$$${jx}^{\mathrm{2}} +\mathrm{2}{kxy}+{by}^{\mathrm{2}} =\mathrm{1}\:{show}\:{that} \\ $$$$\left({kx}+{by}\right)^{\mathrm{3}} \frac{{d}^{\mathrm{2}} {y}}{{dx}^{\mathrm{2}} }={k}^{\mathrm{2}} −{jb} \\ $$

Question Number 115300 Answers: 1 Comments: 0

find from fourier series an expression for log(tanx)

$${find}\:{from}\:{fourier}\:{series}\:{an} \\ $$$${expression}\:{for} \\ $$$$\mathrm{log}\left(\mathrm{tan}{x}\right) \\ $$

Question Number 115298 Answers: 1 Comments: 2

(d^2 y/dx^2 )+log(y)=0

$$\frac{\mathrm{d}^{\mathrm{2}} \mathrm{y}}{\mathrm{dx}^{\mathrm{2}} }+\mathrm{log}\left(\mathrm{y}\right)=\mathrm{0} \\ $$

Question Number 115294 Answers: 2 Comments: 0

Given that N=1×2×3×...×500 is the product of the positive integers from 1 to 500. If N is divisible by 6^k , find the largest possible value of k.

$$\mathrm{Given}\:\mathrm{that}\:{N}=\mathrm{1}×\mathrm{2}×\mathrm{3}×...×\mathrm{500}\:\mathrm{is}\:\mathrm{the} \\ $$$$\mathrm{product}\:\mathrm{of}\:\mathrm{the}\:\mathrm{positive}\:\mathrm{integers}\:\mathrm{from}\:\mathrm{1}\:\mathrm{to}\:\mathrm{500}. \\ $$$$ \\ $$$$\mathrm{If}\:{N}\:\mathrm{is}\:\mathrm{divisible}\:\mathrm{by}\:\mathrm{6}^{{k}} ,\:\mathrm{find}\:\mathrm{the}\:\mathrm{largest}\:\mathrm{possible} \\ $$$$\mathrm{value}\:\mathrm{of}\:{k}. \\ $$

Question Number 115285 Answers: 0 Comments: 0

...♠nice topology ♠... suppose ⟨S , τ ⟩ is Baire′s space and S = ∪_(n=1) ^∞ F_n such that F_n ′s are closed sets prove that:: ∃ m ; F_m ^( °) ≠ ∅ ..m.n.july ...♣m.n.july.1970♣...

$$\:\:\:\:\:\:\:\:...\spadesuit{nice}\:\:\:{topology}\:\spadesuit... \\ $$$${suppose}\:\:\langle{S}\:,\:\tau\:\rangle\:{is}\:\:{Baire}'{s} \\ $$$${space}\:\:\:{and}\: \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:{S}\:=\:\underset{{n}=\mathrm{1}} {\overset{\infty} {\cup}}{F}_{{n}} \:\:\:{such} \\ $$$${that}\:\:{F}_{{n}} '{s}\:\:{are}\:{closed}\:{sets}\: \\ $$$$\:\:\:\:{prove}\:\:{that}:: \\ $$$$\:\:\:\exists\:{m}\:;\:{F}_{{m}} ^{\:°} \:\neq\:\varnothing\:\:\:..{m}.{n}.{july} \\ $$$$\:\:\:\:\:\:\:\:\:...\clubsuit{m}.{n}.{july}.\mathrm{1970}\clubsuit... \\ $$

Question Number 115273 Answers: 2 Comments: 0

... advanced mathematics... evaluate::: Δ=∫_0 ^( ∞) ((cos(ln(x)))/((x+1)^2 )) dx =??? ...m.n.july.1970...

$$\:\:\:\:\:\:\:\:...\:{advanced}\:\:{mathematics}... \\ $$$$ \\ $$$$\:\:\:\:\:{evaluate}::: \\ $$$$\:\:\:\: \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\Delta=\int_{\mathrm{0}} ^{\:\infty} \:\frac{{cos}\left({ln}\left({x}\right)\right)}{\left({x}+\mathrm{1}\right)^{\mathrm{2}} }\:{dx}\:=??? \\ $$$$ \\ $$$$\:\:\:\:\:\:\:...{m}.{n}.{july}.\mathrm{1970}... \\ $$$$\: \\ $$

Question Number 115268 Answers: 1 Comments: 0

(√(4^x −5.2^(x+1) +25)) +(√(9^x −2.3^(x+2) +17)) ≤ 2^x −5

$$\sqrt{\mathrm{4}^{{x}} −\mathrm{5}.\mathrm{2}^{{x}+\mathrm{1}} +\mathrm{25}}\:+\sqrt{\mathrm{9}^{{x}} −\mathrm{2}.\mathrm{3}^{{x}+\mathrm{2}} +\mathrm{17}}\:\leqslant\:\mathrm{2}^{{x}} −\mathrm{5} \\ $$

Pg 1033 Pg 1034 Pg 1035 Pg 1036 Pg 1037 Pg 1038 Pg 1039 Pg 1040 Pg 1041 Pg 1042

Contact: info@tinkutara.com