Question

If acosteta+bsinteta=p, asinteta-bcosteta=q then which of the following conditions is true?
a)a^2+b^2=p^2+q^2
b)a^2+b^2=p^2-q^2
c)a^2-b^2=P^2+q^2
d)a^2-b^2=p^2-q^2

Answer 1

option a is correct....

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