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If sin x+sin^(2)x=1, " then " cos^(8)x+...

If `sin x+sin^(2)x=1, " then " cos^(8)x+2 cos^(6)x+cos^(4)x=`

A

0

B

`-1`

C

2

D

1

Text Solution

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The correct Answer is:
D
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OBJECTIVE RD SHARMA ENGLISH-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
  1. If cos(A-B)=3/5 and tan A tan B=2, then (a) cos Acos B=1/5 (b) sin A ...

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  2. The value of (3+cot76^@cot16^@)/(cot76^@+cot16^@) is

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  3. If sin x+sin^(2)x=1, " then " cos^(8)x+2 cos^(6)x+cos^(4)x=

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  4. If a=b cos((2pi)/3)= c cos((4pi)/3), then write the value of a b+b c+c...

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  5. If sinα.sinβ−cosα.cosβ+1=0 then show that 1+cotα.tanβ=0

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  6. If sintheta(1)+sintheta(2)+sintheta(3)=3, then cos theta(1)+cos theta(...

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  7. If A lies in the third quadrant and 3 tan A-4 = 0, then 5 sin 2A + 3si...

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  8. tan 5x tan3x tan2x=

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  9. The value of sin12^(@)sin24^(@)sin48^(@)sin84^(@), is

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  10. If A+B+C=(3pi)/2, t h e ncos2A+cos2B+cos2C is equal to 1-4cos Acos Bc...

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  11. If A+C=B,then tanA tanBtanC=

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  12. If tan(cotx)=cot(tanx), then sin2x is equal to

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  13. If tan theta=a/b then b cos 2theta+asin 2theta=

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  14. If A=130^(@)and x=sinA+cosA, then

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  15. The value of the expression |vecaxxvecb|^(2)+(veca.vecb)^(2) is….. .

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  16. If A=sin^(2)theta+cos^(4)theta, then find all real values of theta.

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  17. about to only mathematics

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  18. Which of the following statement is incorrect

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  19. The value of sin(pi/14)sin((3pi)/14)sin((5pi)/14) is

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  20. If sintheta+cosectheta=2, then "sin"^(2)theta+"cosec"^(2)theta is equa...

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