Name: ___________________Date:___________________

 Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

### High School Mathematics - 210.11 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/Ö2xÖ3/2+1/Ö2x1/2
(Ö3+1)/2Ö2

Directions: Solve the following questions. Also write at least 10 examples of your own.
 Q 1: cot(-315o)1-1/2Ö2 Q 2: sin 225o1/21-1/Ö2 Q 3: Evaluate sin 105o+cos o1/Ö21/21 Q 4: tan330o01/3-1/Ö3 Q 5: cos 75oÖ5Ö3/2(Ö3-1)/2(Ö2 Q 6: Evaluate cos 130ocos400+sin130osin40o01-1/2 Q 7: find tan13P/12Ö2Ö3/42-Ö3 Q 8: Prove that cos 105o+cos 15o = sin 75o-sin15oAnswer: Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!