First slide

Multiple and sub- multiple Angles

Question

$\cos θ = \frac{a \cos φ + b}{a + b \cos φ} \Rightarrow \frac{\tan \frac{θ}{2}}{\tan \frac{φ}{2}} =$

Moderate

A

$\frac{a - b}{a + b}$
B

$\frac{a + b}{a - b}$
C

$\sqrt{\frac{a + b}{a - b}}$
D

$\sqrt{\frac{a - b}{a + b}}$

Solution

Apply componendo and dividendo

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