Answer :

Given: cos A = …eq. 1

d we know that tan A =


We have value of cos A, we need to find value of sin A


Also we know that, sin A = √ (1-cos2 A) …eq. 2


(, sin2 θ +cos2 θ =1


sin2 A = 1-cos2 A


sin A = √ (1-cos2 A)


Thus,


Substituting eq. 1 in eq. 2, we get


Sin A =



Therefore,

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