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0 votes
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in Mathematics by (59.3k points)

यदि θ = 45° तो cos2 θ sin2 θ का मान होगा

(A) 1

(B) 1/2

(C) 0

(D) 3/2

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2 Answers

+1 vote
by (60.1k points)

सही विकल्प है (A) 1

+1 vote
by (100 points)

θ=45°

cosθ=cos(45)=1/√2

cos²(45)=(1/√2)²=1/2


sinθ=sin(45)=1/√2

sin²(45)=(1/√2)²=1/2


cos²θ.sin²θ=(1/2).(1/2)=1/4


अथवा यदी यह पूछा गया हो –

cos²θ+sin²θ = 1/2 + 1/2 = 1------(A)

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