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Show that cos pi/2+x=-sinx

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Show that cos pi/2+x=-sinx
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Veena Singh☺️? 5 years, 2 months ago

Cos( π/2 +x ) lie in second quadrant , sin is negative in second quadrant and cos (π/2 + x) changes to - sin x ( cos thita changes into sin thita )
http://mycbseguide.com/examin8/

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