In the following problem the expression is the right side of

In the following problem, the expression is the right side of the formula for cos(o p) with particular values for aand p sin sin COS 12 a. Identify and B in the expression The value of ou is The value of B is b. Write the expression as the cosine of an angle The expression is cos Enter your answer in each of the answer boxes TOSHIBA

Solution

cos(5pi/12)cos(pi/4) + sin(5pi/12)sin(pi/4)

This is of the form

cos A cos B + sin A sin B

which is equal to cos(A-B)

Therefore for the given expression we get

cos(5pi/4 - pi/4)

A=5pi/4   and B=pi/4