Find the exact value of the expressions cos(a + b), sin(a + ) and tan(a + b) under the
following conditions:
40
sin(a) = 77, a lies in quadrant I, and sin(B) = 13lies in quadrant II.
a. cos(a +B) =
(Simplify your answer. Type an exact answer, using radicals as needed. Use integers or
fractions for any numbers in the expression.)
b. sin(a + ) =
(Simplify your answer. Type an exact answer, using radicals as needed. Use integers or
fractions for any numbers in the expression
c. tan(a + B)=
(Simplify your answer. Type an exact answer, using radicals as needed. Use integers or
fractions for any numbers in the expression.)