Name: ___________________

Date:___________________

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Geometry
8.10 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.

Name: ___________________

Date:___________________

Geometry
8.10 Trignometry Formulas

Q 1: find tan13P/12
2
3/4
2-3

Q 2: evaluate sin272o - sin260o
3
(5-1)/8
1/2

Q 3: tan330o
0
-1/3
1/3

Q 4: cot(-315o)
2
-1/2
1

Q 5: Evaluate sin 105o+cos o
1/2
1/2
1

Q 6: Evaluate cos 130ocos400+sin130osin40o
1
-1/2
0

Q 7: cos 75o
5
(3-1)/2(2
3/2

Q 8: Evaluate cos 210o
3
1/2
3/2

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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