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Quandaries & Queries
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Topic:
trigonometry identities
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Some trig expressions
2004-05-23
From A student:
Prove:
sin A + sin B = 2sin(A+B/2)cos(A-B/2)
cos A - cos B = -2sin(A+B/2)sin(A-B/2)
cos A + cos B = 2cos(A+B/2)cos(A-B/2)
sin A - sin B = 2cos(A+B/2)sin(A+B/2)
Answered by Penny Nom.
An identity in trigonometry
2002-10-17
From Alex:
I really need help with proving this identity.
(1+cosx+sinx)/(1+cosx-sinx) = secx + tanx
Answered by Penny Nom.
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