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If the equation cos3xcos^(3)x+sin3xsin^(...

If the equation `cos3xcos^(3)x+sin3xsin^(3)x=0`, then x is equal to

A

`(2n+1)(pi)/(4)`

B

`(2n-1)(pi)/(4)`

C

`(npi)/(4)`

D

`(npi)/(3)`

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The correct Answer is:
A
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TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS -Evaluation Test
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  4. Solve the equation (sinx+cosx)^(1+sin2x)=2, when 0lt=xlt=pi

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  12. In triangleABC, If (b+c)/(11)=(c+a)/(12)=(a+b)/(13), then cosC=

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  14. If the area of the circle is A1 and the area of the regular pentagon i...

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  15. In a triangle A B C , if a : b : c=4:5:6 , then ratio between its circ...

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  16. Given b = 2, c = sqrt3, angle A = 30^(@), then inradius of DeltaABC is

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  17. If, in Delta ABC, a^(4) + b^(4) + c^(4) = 2a^(2)(b^(2) + c^(2)) then :...

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  18. In a triangleABC,B=pi/8, C=(5pi)/(8). The altitude from A to the side ...

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  19. If tan.(A)/(2)andtan.(B)/(2) are the roots of the quadratic equation 6...

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