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

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

A

0

B

`-1`

C

1

D

2

Text Solution

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The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-TRIGONOMETRIC RATIOS AND IDENTITIES -EXERCISE 1 A ( TRIGONOMETRIC FUNCTIONS)
  1. If tan^(2)theta = (1-e^2) show that sec theta + tan^(3). "cosec" theta...

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  2. If sin theta + sin^(2) theta =1 , " then " cos^(2) theta + cos^(4) th...

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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 cos x + cos^(2) x =1 , " then " sin^(12) x + 3 sin^(10)x + 3sin^(8...

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  5. If cos alpha + cos beta + cos gamma =3 , " then " sin alpha + sin bet...

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  6. If sin theta 1+ sin theta 2+ sin theta 3=3 " then " cos theta 1 + cos...

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  7. If sin theta , cos theta are ther roots of the equation ax^(2)-bx+c...

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  8. If k=(1+ sin A) (1+ sin B)(1+ sin C)=(1- sin A) (1- sin B) (1- sin C) ...

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  9. If k=( sec A + tan A) ( sec B+ tan B) sec C + tan C)=(sec A - tan A)(s...

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  10. If sec theta =a+(1)/(4a) " then " sec theta + tan theta =

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  11. If "cosec " theta =p+(1)/(4p) , " then cosec " theta + cot theta =

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  12. If "cosec"^(2) theta = (4xy)/((x+y)^(2)), then

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  13. If a sin x = b cos x =(2c tan x )/(1- tan^(2) x) " then " ((a^(2)-b^(...

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  14. If (2 sin theta )/(1+ cos theta + sin theta )=x, find the value of (1...

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  15. sqrt(1-sin^(2)100^(@))*sec 100^(@)=

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  16. sqrt((1+sinA)/(1-sin A ))=

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  17. If sqrt((1+ cos theta )/(1- cos theta ))="cosec " theta + cot theta " ...

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  18. If x=a cos^(3) theta , y= a sin^(3) theta then

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  19. If x= a cos^(4) theta, y=bsin^(4) theta , then sqrt(x//a) + sqrt(y//...

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  20. If x cos theta + y sin theta = a , x sin theta - y cos theta = b the...

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