Question: Given that cos A = 4/5, and A is an obtuse angle measured in radians, find the exact value of: a. sin A b.

Given that cos A = − 4/5, and A is an obtuse angle measured in radians, find the exact value of:

a. sin A

b. cos (π + A)

c. sin (π/3 + A)

d. tan (π/4 + A)

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