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If tanA=(1-cosB) /sinB, prove that tan2A=tanB?
Most Upvoted Answer
If tanA=(1-cosB) /sinB, prove that tan2A=tanB?
TanA=(1-CosB)/sinB =2sin²(B/2)/2sinB/2*cosB/2 =tanB/2Now u take B=2Btherefore, u get tanB= 2sin²B/2sinBcosB=(1-cos2B)/sin2B=tan2A(proved) hope u'll understand..
Community Answer
If tanA=(1-cosB) /sinB, prove that tan2A=tanB?
Change all into sin and cos function.. SinASinB=cosA - cosAcosBusing formula cos(B-A) we easily get that B-A=A B=2A , Tan2A=TanB
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If tanA=(1-cosB) /sinB, prove that tan2A=tanB?
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