Evaluate the expression cos75°sin15°+sin75°cos15°
3 answers
Ted/David/Chad -- why are you switching names?
recall that sin(A+B) = sinA cosB + cosA sinB
so, what do you think?
so, what do you think?
Cos75 = sin15.
sin75 = Cos15.
Cos75 * Cos75 + sin75 * sin75 = Cos^2(75) + sin^2(75) = 1.
sin75 = Cos15.
Cos75 * Cos75 + sin75 * sin75 = Cos^2(75) + sin^2(75) = 1.