Michael J. answered • 04/14/17
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5
(5)
Understanding all Sines of Triangles
This is a difference in perfect squares, if we expand
sin2y - cos2y =
-(cos2y - sin2y) =
-cos(2y)
Wooow W.
asked • 04/13/17(Siny - cosy) (siny + cosy)
I need to simplify using Pythagorean identities I need hel asap
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2 Answers By Expert Tutors
Arturo O. answered • 04/14/17
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Experienced Physics Teacher for Physics Tutoring
Note you have a difference of squares in its factored form.
(siny - cosy) (siny + cosy) = sin2y - cos2y = -(cos2y - sin2y) = -cos(2y)
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