If A=30 and B= 60, verify that cos (A+B) = cos A* cos B - sinA* sinB.
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A = 30 and B = 60
L.H.S.
Cos (30 + 60) = Cos 90 = 0
R.H.S
Cos 30 * Cos 60 - Sin 30 * Sin 60
√3/2 * 1/2 - 1/2 * √3/2
√3/4 - √3/4
0
L.H.S = R.H.S
A = 30 and B = 60
L.H.S.
Cos (30 + 60) = Cos 90 = 0
R.H.S
Cos 30 * Cos 60 - Sin 30 * Sin 60
√3/2 * 1/2 - 1/2 * √3/2
√3/4 - √3/4
0
L.H.S = R.H.S
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