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AllQuestion and Answers: Page 1370

Question Number 75212 Answers: 1 Comments: 0

Question Number 75208 Answers: 1 Comments: 0

Prove that : cos 18^0 −sin 18^0 = (√2) sin 2

$$\:\mathrm{Prove}\:\mathrm{that}\::\:\mathrm{cos}\:\mathrm{18}^{\mathrm{0}} −\mathrm{sin}\:\mathrm{18}^{\mathrm{0}} \:=\:\sqrt{\mathrm{2}}\:\mathrm{sin}\:\mathrm{2} \\ $$

Question Number 75209 Answers: 2 Comments: 0

Question Number 75204 Answers: 0 Comments: 0

Question Number 75203 Answers: 1 Comments: 0

Question Number 75193 Answers: 2 Comments: 0

it is given that cos(π/5)=((1+(√5))/4) calculate the exact value of cos((2π)/5) and cos((3π)/5)

$${it}\:{is}\:{given}\:{that}\:{cos}\frac{\pi}{\mathrm{5}}=\frac{\mathrm{1}+\sqrt{\mathrm{5}}}{\mathrm{4}} \\ $$$${calculate}\:{the}\:{exact}\:{val}\mathrm{ue}\:{of}\: \\ $$$${cos}\frac{\mathrm{2}\pi}{\mathrm{5}}\:\:\:{and}\:\:{cos}\frac{\mathrm{3}\pi}{\mathrm{5}} \\ $$

Question Number 75186 Answers: 1 Comments: 7

7n ≡ 1 (mod 5) What is the general form of n ?

$$\mathrm{7}{n}\:\equiv\:\mathrm{1}\:\left(\mathrm{mod}\:\mathrm{5}\right) \\ $$$$\mathrm{What}\:\mathrm{is}\:\mathrm{the}\:\mathrm{general}\:\mathrm{form}\:\mathrm{of}\:{n}\:? \\ $$

Question Number 75180 Answers: 0 Comments: 2

There are 6 girls and four boys in a class. 3 students are choosen at random so as to be awarded a scholaship.In how many ways can this be done if atlease 1 boy and 1 girl must in the selection

$${There}\:{are}\:\mathrm{6}\:{girls}\:{and}\:{four}\:{boys}\:{in}\:{a}\:{class}. \\ $$$$\mathrm{3}\:{students}\:{are}\:{choosen}\:{at}\:{random}\:{so}\:{as}\:{to}\:{be} \\ $$$${awarded}\:{a}\:{scholaship}.{In}\:{how}\:{many}\:{ways}\:{can} \\ $$$${this}\:{be}\:{done}\:{if}\:{atlease}\:\mathrm{1}\:{boy}\:{and}\:\mathrm{1}\:{girl}\:{must} \\ $$$${in}\:{the}\:{selection} \\ $$$$ \\ $$

Question Number 75178 Answers: 1 Comments: 0

givn that z = 1−i(√3) express z in the form z = r(cosθ + isinθ), hence express z^7 in the form re^(iθ)

$${givn}\:{that}\:{z}\:=\:\mathrm{1}−{i}\sqrt{\mathrm{3}}\:{express}\:{z}\:{in}\:{the}\:{form}\: \\ $$$$\:{z}\:=\:{r}\left({cos}\theta\:+\:{isin}\theta\right),\:{hence}\:{express} \\ $$$${z}^{\mathrm{7}} \:{in}\:{the}\:{form}\:{re}^{{i}\theta} \\ $$

Question Number 75177 Answers: 2 Comments: 2

Question Number 75176 Answers: 1 Comments: 0

P=(√(25x−50))−14(√((x−2)/4))+(√(9x−18)), x≥2 a) Simplify the equation b) Find x if P=3

$$\mathrm{P}=\sqrt{\mathrm{25}{x}−\mathrm{50}}−\mathrm{14}\sqrt{\frac{{x}−\mathrm{2}}{\mathrm{4}}}+\sqrt{\mathrm{9}{x}−\mathrm{18}},\:\:{x}\geqslant\mathrm{2} \\ $$$$\left.\mathrm{a}\right)\:\mathrm{Simplify}\:\mathrm{the}\:\mathrm{equation} \\ $$$$\left.\mathrm{b}\right)\:\mathrm{Find}\:\mathrm{x}\:\mathrm{if}\:\mathrm{P}=\mathrm{3} \\ $$

Question Number 75175 Answers: 1 Comments: 0

solve the differential equation (x^2 −1)(dy/dx) + 2y = 0 when y=3 and x= 2,expressing your answer in the form y=f(x)

$${solve}\:{the}\:{differential}\:{equation} \\ $$$$\:\left({x}^{\mathrm{2}} −\mathrm{1}\right)\frac{{dy}}{{dx}}\:+\:\mathrm{2}{y}\:=\:\mathrm{0}\:{when}\:{y}=\mathrm{3}\:{and}\:{x}=\:\mathrm{2},{expressing} \\ $$$${your}\:{answer}\:{in}\:{the}\:{form}\:{y}={f}\left({x}\right) \\ $$

Question Number 75173 Answers: 1 Comments: 1

Question Number 75166 Answers: 1 Comments: 0

Question Number 75158 Answers: 1 Comments: 0

Question Number 75156 Answers: 1 Comments: 0

Question Number 75147 Answers: 1 Comments: 0

hello show that sin((5π)/(18))cos((13π)/(18))=−(1/2)sin((4π)/9)

$$\mathrm{hello} \\ $$$$\mathrm{show}\:\mathrm{that}\: \\ $$$$\mathrm{sin}\frac{\mathrm{5}\pi}{\mathrm{18}}\mathrm{cos}\frac{\mathrm{13}\pi}{\mathrm{18}}=−\frac{\mathrm{1}}{\mathrm{2}}\mathrm{sin}\frac{\mathrm{4}\pi}{\mathrm{9}} \\ $$

Question Number 75141 Answers: 1 Comments: 2

Question Number 75136 Answers: 1 Comments: 3

Question Number 75131 Answers: 1 Comments: 0

please help me to show that tan^2 ((π/8))+2tan((π/8))−1=0

$$\mathrm{please}\:\mathrm{help}\:\mathrm{me}\:\mathrm{to}\:\mathrm{show}\:\mathrm{that} \\ $$$$\mathrm{tan}^{\mathrm{2}} \left(\frac{\pi}{\mathrm{8}}\right)+\mathrm{2tan}\left(\frac{\pi}{\mathrm{8}}\right)−\mathrm{1}=\mathrm{0} \\ $$

Question Number 75124 Answers: 0 Comments: 0

Question Number 75122 Answers: 0 Comments: 4

Question Number 75110 Answers: 1 Comments: 0

Question Number 75105 Answers: 0 Comments: 1

Question Number 75104 Answers: 1 Comments: 0

Question Number 75102 Answers: 0 Comments: 0

show by integration that the centroid of a semi−circular lamina of radius a from the centre is ((4a)/(3π)).

$$\mathrm{show}\:\mathrm{by}\:\mathrm{integration}\:\mathrm{that}\:\mathrm{the}\:\mathrm{centroid} \\ $$$$\mathrm{of}\:\mathrm{a}\:\mathrm{semi}−\mathrm{circular}\:\mathrm{lamina}\:\mathrm{of}\:\mathrm{radius}\:{a}\: \\ $$$$\mathrm{from}\:\mathrm{the}\:\mathrm{centre}\:\mathrm{is}\:\:\:\frac{\mathrm{4}{a}}{\mathrm{3}\pi}. \\ $$

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