12 Suppose that a and B are angles given as follows: sin a 13 and a is an angle in quadrant 4. 60 COS B 61 and B is an angle in quadrant 2. Compute the exact value of sin(a + 8).Find tan(a + 8) exactly, given sin a = and sin B co | co where a terminates in quadrant III and B terminates in quadrant I. Enter your final result in exact, simplified form. Question Help: 6 Message instructorFind tan(a -+ 8) exactly, given seco and csc B = where a terminates in quadrant IV and B terminates in quadrant III. Give your final result in exact, simplified form. 134 Find sin(a + 8) exactly, given sin a and sin B where a terminates in quadrant IV and B 7 terminates in quadrant IV. Enter your final result in exact, simplified form