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ICSE Class 10 Answered

Prove that c ot^2A -cos ^2A =cos ^2A ×cot ^2A
Asked by dantkalesamarth | 22 Nov, 2018, 10:02: PM
answered-by-expert Expert Answer

cot2A - cos2A = cos2A × cot2A

L.H.S = cot2A - cos2A

= (cos2A/sin2A) - cos2A 

=cos2A[(1-sin2A)/sin2A]

= cos2A(cos2A/ sin2A)    [1-sin2A=cos2A]

=cos2A × cot2A

= R.H.S

Answered by Yasmeen Khan | 22 Nov, 2018, 10:34: PM

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