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if sin x + sin^2 x = 1, then the value ...

if ` sin x + sin^2 x = 1`, then the value of `cos^2 x + cos^4x` is

A

1

B

2

C

`1.5`

D

none of these

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The correct Answer is:
A
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OBJECTIVE RD SHARMA-TRIGONOMETRIC RATIOS AND IDENTITIES-Exercise
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  2. If (sin(x+y))/(sin(x-y))=(a+b)/(a-b) , then show that (tanx)/(tany)=(...

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  3. if sin x + sin^2 x = 1, then the value of cos^2 x + cos^4x is

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  4. If tan(x/2)=cosec x - sin x then the value of tan^2(x/2) is

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  5. If cosA=3/4, then 32 sin, A/2 sin, (5A)/2= (A) sqrt(11) (B) -sqrt(11) ...

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  6. (1+cos.(pi)/(8))(1+cos.(3pi)/(8))(1+cos.(5pi)/(8))(1+cos.(7pi)/(8)) is...

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

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  12. if sin(alpha+beta)=1 and sin(alpha-beta)=1/2 " "0lealpha,beta,lepi/2,t...

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  13. If cos(theta-alpha) = a and cos(theta-beta) = b then the value of sin^...

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  14. If K=sin(pi/(18))sin((5pi)/(18))sin((7pi)/(18)), then the numerical va...

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  15. Find the value of log tan1^0logtan2^0logtan89^0

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  16. If 1+sinx+sin^2x+sin^3x+oo is equal to 4+2sqrt(3),0<x<pi, then x is eq...

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  17. If If x cosalpha+y sinalpha=2a, x cos beta+y sinbeta=2aand 2sin""(alph...

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  18. If tan x =(2b)/ (a- c), y = acos^2 x + 2bsin x cos x + csin^2 x, z=as...

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  19. If alpha+beta+gamma=2pi then

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  20. If sintheta-costhetalt0, then theta lies between

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