Question

Use the sum and difference identities to rewrite the following expression as a trigonometric function of a single number.2лम2л五COS(15) w() - Sin(ਤੋਂ ) sin()-(COS

Answer 1

The sum identity for Cosine is given as:

`\cos (A+B)=\cos A\cos B-\sin A\sin B`

This is the same for the given equation in the equation, assuming:

`\begin{gathered} A=(2\pi)/(5) \\ B=(\pi)/(12) \end{gathered}`

Hence, the correct answer is:

`\cos (A+B)=\cos A\cos B-\sin A\sin B`