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If sinx+sin^2x=1," then the value of "co...

If `sinx+sin^2x=1," then the value of "cos^12x+3cos^10x+3cos^8x+cos^6x-2` is equal to

A

2

B

1

C

2

D

`-1`

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The correct Answer is:
C
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OBJECTIVE RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
  1. If ys invarphi=x s in(gamma+delta)=cos(alpha-beta)sin(gamma-delta), pr...

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  2. about to only mathematics

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  3. If sinx+sin^2x=1," then the value of "cos^12x+3cos^10x+3cos^8x+cos^6x-...

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  4. If ABCD is a cyclic quadrilateral, then the value of cosA-cosB+cosC-co...

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  5. If ABCD is a cyclic quadrilateral such that 12tanA-5=0 and 5cosB+3=0, ...

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  6. If sin (picot theta)=cos (pi tantheta), then

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  7. The value of sinx siny sin(x-y)+sinysinz sin(y-z) +sinz sinx sin(z...

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  8. If ABCD is a convex quadrilateral such that 4 sec A+5=0, then find th...

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  9. If (tanalpha+tanbeta)/(cot alpha+cot beta)+{cos(alpha-beta)+1}^(-1)=1,...

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  10. Prove:cos(pi/15)cos((2pi)/15)cos((3pi)/15)cos((4pi)/15)cos((5pi)/15)co...

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  11. The value of cos12^(@)cos24^(@)cos36^(@)cos48^(@)cos60^(@)cos72^(@)cos...

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  12. The value of sin""(15pi)/(32)sin""(7pi)/(16)sin""(3pi)/(8), is

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  13. sum(r=1)^(n-1)cos^(2) (rpi)/2 is equal to

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  14. The value of cot theta-tantheta-2tan2theta-4tan4theta-8cot8theta, is

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  15. If cos(x-y) , cos x and cos (x+y) are in H.P. , then cos x. sec (y/2...

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  16. The value of tan20^(@)+2 tan50^(@)-tan70^(@), is

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  17. If cosA+cosB+cosC=0, then cos3A+cos3B+cos3C is equal to

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  18. The minimum value of cos 2 theta + cos theta for all real values of th...

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  19. cos9^@-sin9^@=

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  20. If y=(sin 3theta)/(sintheta), theta nen pi, then

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