Maths / Introduction to Trigonometry / Trigonometric Identities

QUESTION
 

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

OPTIONS
A. 

1

B. 

frac {1}{2}

C. 

2

D. 

3

Right Option : A

EXPLANATION
Explain TypeExplanation Content
Text

large cos;A+cos^2;A=1

dpi{120}Rightarrow cos;A=1-cos^2;A=sin^2;A

Rightarrow cos^2;A=sin^4;A

Rightarrow 1- sin^2;A=sin^4;A

Rightarrow 1 = sin^2;A + sin^4;A

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