Question: Prove each equation. (a) Equation 18a (b) Equation 18b (c) Equation 18c 18a 18b 18c sin x cos y = [sin(x + y) + sin(x

Prove each equation.

(a) Equation 18a 

(b) Equation 18b

(c) Equation 18c

18a 18b 18c sin x cos y = [sin(x + y) + sin(x - y)] cos x cos y=[cos(x + y) + cos(x - y)] sin x sin y =

18a 18b 18c sin x cos y = [sin(x + y) + sin(x - y)] cos x cos y=[cos(x + y) + cos(x - y)] sin x sin y = [cos(x - y) cos(x + y)]

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