a)I have no idea how a diagram looks like I am not an engineer, however, I can solve equations.Originally Posted bymathAna1ys!5

b) .

Now this problem want to factored thus,

Thus,

.

By the Pythagorean Identities,

By the reciprocal identities,

Thus,

Now just use the one your need (the positive one or negative one) and use the inverse-tan on calculator.

Q.E.D.