Find the exact value of sin 105° using the relationship given below.

105° = 150° - 45°

Determine the exact value of the following expression by using a sum or difference identity:

sin 645°

Convert the given trigonometric expression into an equivalent expression using a product-to-sum identity.

sin(35x)cos(38x)

Which of the following cofunctions has the same value as $\sin136\degree24^{\prime}$?

Write the given trigonometric expression in terms of $\alpha$ only.

$\sin\left(\frac{2\pi}{3}-\alpha\right)$