8. Express the product sin30 cos50 as a sum. 1/2 (sin80-sin20) 1/2 (sin80+sin20) sin80-sin20 sin80+sin20)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 40E
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pls answer no.8

8. Express the product sin30 cos50 as a
sum.
O 1/2 (sin80-sin20)
O 1/2 (sin80+sin20)
sin80-sin20
sin80+sin20)
9. Write the product 2 sin(2Tt/9)
cos(T/9) as a sum of function values.
sin(Tt/3)+sin(t/9)
sin(Tt/3)-sin(t/9)
2 sin(t/9)-cos(T/9)
2sin(T/9)+cos(t/9)
10. Express cos55°cos45° as a sum.
O 1/2 (cos100°+ cos10°)
O 2 (sin100°- sin10°)
sin100°+ cos10°
-2 (sin50°+ cos10°)
Transcribed Image Text:8. Express the product sin30 cos50 as a sum. O 1/2 (sin80-sin20) O 1/2 (sin80+sin20) sin80-sin20 sin80+sin20) 9. Write the product 2 sin(2Tt/9) cos(T/9) as a sum of function values. sin(Tt/3)+sin(t/9) sin(Tt/3)-sin(t/9) 2 sin(t/9)-cos(T/9) 2sin(T/9)+cos(t/9) 10. Express cos55°cos45° as a sum. O 1/2 (cos100°+ cos10°) O 2 (sin100°- sin10°) sin100°+ cos10° -2 (sin50°+ cos10°)
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