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The value of co s pi/5 co s.2pi / 5 c o ...

The value of `co s pi/5 co s.2pi / 5 c o s 4pi / 5 co s 8pi / 5 = `

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CBSE COMPLEMENTARY MATERIAL-TRIGONOMETRIC FUNCTIONS -SHORT ANSWER TYPE QUESTIONS
  1. Prove the following Identities (sec8theta-1)/(sec4theta-1)=(tan8the...

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  2. find the value ofsqrt3cosec20^(@)-sec20^(@)

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  3. The value of co s pi/5 co s.2pi / 5 c o s 4pi / 5 co s 8pi / 5 =

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  4. cos 20^@ cos 40^@ cos 80^@=

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  5. Find the general solution of the following equations sin 7x = sin 3...

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  6. Find the general solutions of each of the following equations : (1) ...

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  7. Solve sin x-3 sin 2x + sin 3x = cos x -3 cos 2x + cos 3x.

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  8. Draw the graph of cosx, sin x and tan x in [0, 2pi]

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  9. Draw sin x, sin 2x and sin 3x on same graph and with same scale

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  10. Evaluate(i) cos 36^(@) (ii)tan((13pi)/(12))

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  11. cos^4(pi/8)+cos^4((3pi)/8)+cos^4((5pi)/8)+cos^4((7pi)/8)=

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  12. If tanA=tanB=xa n dcotB-cotA=y , prove that cot(A-B)=1/x+1/y

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  13. If (sin(x+y))/(sin(x-y))=(a+b)/(a-b) , then show that (tanx)/(tany)=(...

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  14. if coxx=cosalpha.cosbeta then prove that tan((x+alpha)/2)*tan((x-alpha...

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  15. If tan(picostheta)=cot(pisintheta), then cos(theta-(pi)/(4))=pm(1)/(2s...

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  16. If sin(theta+alpha)=aa n dsin(theta+beta)=b , prove that cos2(alpha-be...

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  17. Find the range of 5 sin x – 12 cos x + 7

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  18. If alpha and beta are the solutions of the equation atan theta+ b s...

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  19. If alphaa n dbeta are the solutions of the equation at a ntheta+bs e c...

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  20. 2 sin^(2) beta + 4 cos( alpha+ beta) sin alpha sin beta + cos ( 2 alph...

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