What is the value of [1 – sin (90 – 2a)] / [1 + sin (90 + 2a)]?
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[1- sin (90-2a)] / [1+sin(90+2a)]
=( 1-cos 2a ) / (1+cos 2a)
= 2sin²a / 2cos² a
= tan²a
=( 1-cos 2a ) / (1+cos 2a)
= 2sin²a / 2cos² a
= tan²a
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