Mathematics, 04.12.2020 23:30, jdiel14

Which expression is equivalent to cos(pi/12)cos(5pi/12)+sin(pi/12)sin (5pi/12)? a. cos(-pi/3)
b. sin(-pi/3)
c. cos(pi/2)
d. sin(pi/2)

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Which expression is equivalent to cos(pi/12)cos(5pi/12)+sin(pi/12)sin (5pi/12)? a. cos(-pi/3)