Exercise ID243

Geometry → Trigonometry → Simplifying trigonometric expressions
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Simplify the following expression:

tg2x-sin2x

tg2x-sin2x =sin2xcos2x-sin2x =sin2x-cos2x·sin2xcos2x =sin2x1-cos2xcos2x =sin2x·sin2xcos2x =tg2x·sin2x
tg2x-sin2x=tg2x·sin2x
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