Mark M. answered • 08/17/15

Tutor

5.0
(243)
Mathematics Teacher - NCLB Highly Qualified

7π/12 = 4π/12 + 3π/12

7π/12 = π/3 + π/4

sin (7π/12) = sin (π/3 + π/4) Now use the addition formula for sine.

Mark M.

Certain values of the sine function are known, e.g., π/3 and π/4.

The goal is to express 7π/12 as a sum or difference of these known values so that the sum/difference formulas can be used.

Experience (and knowing how to reduce fractions) informs that 4π/12 is equal to π/3 and 3π/12 is equal to π/4.

OK?

Report

08/17/15

Amber M.

08/17/15