Answer :

As we have to prove:


y =

As we need to get (1 – cos α + sin α) in numerator, so we need to bring this term in numerator.

Multiplying numerator and denominator by

(1 – cos α + sin α),we get -

using (a + b) (a-b) = a2 – b2, we get:

1 – cos2α = sin2 α


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