Answers Precalculus Trigonometric Double Angle Identities — QuizQuestion 2

2

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Trigonometric Double Angle Identities — Quiz

Question 2 • Precalculus

Suppose sine of x is equal to 4 fifths and cosine of x is less than 0 What is the value of cosine of 2 x ?

Answer

A

7 over 25

B

14 over 25

C

negative 14 over 25

D

negative 7 over 25

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