Asked by Chad

Evaluate the expression cos75°sin15°+sin75°cos15°
Answered by Writeacher
Ted/David/Chad -- why are you switching names?
Answered by oobleck
recall that sin(A+B) = sinA cosB + cosA sinB
so, what do you think?
Answered by henry2,
Cos75 = sin15.
sin75 = Cos15.

Cos75 * Cos75 + sin75 * sin75 = Cos^2(75) + sin^2(75) = 1.

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