Question 857164
Find the exact value of each expression
a) sin7π/3=√3/2 (reference angle of π/3 in quadrant I)
b) cos7π/3=1/2 (reference angle of π/3 in quadrant I)
c) sin9π/4=√2/2 (reference angle of π/4 in quadrant I)
d) cos9π/4=√2/2 (reference angle of π/4 in quadrant I)