1.

2८0556-15170 0050(00६6 — tanb =

Answer»

cotƟ – tanƟ =2cos2Ɵ – 1/sinƟcosƟ

LHS=cosƟ/sinƟ – sinƟ/cosƟ

=cos2Ɵ – sin2Ɵ/sinƟcosƟ

=cos2Ɵ – (1 – cos2Ɵ)/sinƟcosƟ

=cos2Ɵ – 1 + cosƟ/sinƟcosƟ

=2cos2Ɵ – 1/sinƟcosƟ



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