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अगर cos A+cos^² A = 1, तो sin^² A+sin^⁴ A बराबर है ;

a

–1

b

1

c

$frac{1}{2}$

d

0

Answer : Option B

Explanation :

cos A = 1 – cos^² A = sin^² A

∴ sin² A + sin⁴A = cosA + cos²A = 1