PLEASE help me with these problems. I really need help!

6-94. Use the graph shown at right to write possible equations. a. Write an equation that is a transformation of sine. b. Write an equation that is a transformation of cosine. 2 . 3-95. Suppose a is an angle in Quadrant I and B is a angle in Quadrant IV such that sin a = 3 and cos B = . a. Find the exact value of cos d . b. Find the exact value of sin B. C. Find the exact value of sin(a + B). d. Find the exact value of cos(a + B) . e. Use your calculator to approximate your answer to part (d). 6-96. If cos x = - 4 , xe [n, 3"] (x E [x, 3" ], means x is an "element" of the set of all x's in the interval [x, 3x ]), find exact values for the five other trigonometric functions without finding x. 6-97. Find the period of each function. b. y = COS TX a. y = 5 sin 3x d. y = cos x + 3 C. y = sin Tx 6-98. Simplify cos ( + d ) using the angle sum identity for cosine. Chapter 6: Extending Periodic Functions 299