Answers Precalculus Solving Trigonometric Equations — Cumulative examQuestion 32

32

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Solving Trigonometric Equations — Cumulative exam

Question 32 • Precalculus

Which expression is equivalent to cos(40°)cos(10°) + sin(40°)sin(10°)?

Answer

A

sin(40° – 10°)

B

cos(40° + 10°)

C

sin(40° + 10°)

D

cos(40° – 10°)

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