Question

(cos theta+sin theta)²+(cos theta-sin theta)²​

Answer 1

Answer:

cos2a +sin2a+2sinacosa+cos2a+sin2a-2sinacosa

= 1+1

=2.....

Answer 2

Answer:

(cos thetha+sin thetha)^2+ (cos thetha-sin thetha)^2

=cos^2thetha+sin^2thetha+2sinthetha×costhetha+cos^2thetha+sin^2thetha-2costhetha×sinthetha

=1+1 ( sin^2thetha+ cos^2thetha=1)

=2

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