Q. 194.0( 3 Votes )

If <span lang="EN

Answer :

formula : - (i) cos² A + sin² A = 1

(ii)

We know that α, β lies between 0 and

Cos(α–β) and sin(α + β) are positive

And

and

tan2α = tan[(α + β) + (α – β)]

Hence, Proved.

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