Find the exact value of the expressions cos (a+ B), sin (a + B) and tan (a + B) under the following conditions: cos (a) = 12 ,a lies in quadrant IV, and sin (ß) = B lies in quadrant III. 13 7 a. cos (a+ B) = (Simplify your answer. Type an exact answer, using radicals as needed. Rationalize all denominators. Use integers or fractions for any numbers in the expression.)

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Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.