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(TT/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°)
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(TT/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°)
Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE:
1. Give the measures of the complement and the supplement of an angle measuring 35°.
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pls answer no.10 on paper
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