Maths / Introduction to Trigonometry / Trigonometric Identities

QUESTION
 

If sin: : A+sin^2A=1, then the value of the expression  (cos^2A+cos^4A) is

OPTIONS
A. 

1

B. 

frac {1}{2}

C. 

2

D. 

3

Right Option : A

EXPLANATION
Explain TypeExplanation Content
Text

sin: : A+sin^2A=1,

sin: : A=1-sin^2A= cos^2A

sin^2 : A=cos^4A

1-cos^2 : A=cos^4A

1= cos^2 : A + cos^4A

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