10-1

Formulas:

sin (alpha plus or minus beta)=sin(alpha)cos(beta) plus or minus cos(alpha)sin(beta)

cos(alpha plus or minus beta)= cos(alpha)cos(beta) minus or plus sin(alpha) sin(beta)

Example: Find the exact value of sin 75

sin(45+30)= sin(45)cos(30)+cos(45)sin(30)

Replace angles with values found on the trig chart.

Solve to find your answer.

-Sameer