Answer:
Formula used :
[tex] \sin(x) - \sin(y) = \\ \: 2 \sin( \frac{x - y}{2} ) \times \cos( \frac{x + y}{\\ 2} ) [/tex]
[tex] \cos(x) + \cos(y) = \\ \: 2 \cos( \frac{x - y}{2} ) \times \cos( \frac{x + y}{\\ 2} ) [/tex]
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Verified answer
Answer:
Formula used :
[tex] \sin(x) - \sin(y) = \\ \: 2 \sin( \frac{x - y}{2} ) \times \cos( \frac{x + y}{\\ 2} ) [/tex]
[tex] \cos(x) + \cos(y) = \\ \: 2 \cos( \frac{x - y}{2} ) \times \cos( \frac{x + y}{\\ 2} ) [/tex]