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High School Mathematics - 2
Trignometry Formulas

sin (A + B) = sinA cosB + cosA sinB

sin (A - B) = sinA cosB - cosA sinB

cos (A + B) = cosA cosB - sinA sinB

cos (A - B) = cosA cosB + sinA sinB

tan (A + B) = tanA + tanB / 1 - tanAtanB

tan (A - B) = tanA - tanB / 1 + tanAtanB

Example: cos 15
cos 15o = cos (45 - 30)
cos 45 cos 30 + sin 45 sin 30
1/2x3/2+1/2x1/2
(3+1)/22
Answer: cos 25o = (3+1)/22


Directions: Solve the following questions. Also write at least 10 examples of your own.