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[SOLVED] Finding sine and cosine formulas
If sinx/siny = 1/2 and cosx/cosy = 3 prove:
sin (x + y) = 7/3 sinx cosx
sin (x + y) = sinx cosy = cosx siny
Can someone please give me a hint so that I can start? Thanks.
Homework Statement
If sinx/siny = 1/2 and cosx/cosy = 3 prove:
sin (x + y) = 7/3 sinx cosx
Homework Equations
sin (x + y) = sinx cosy = cosx siny
The Attempt at a Solution
Can someone please give me a hint so that I can start? Thanks.