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Circular Functions and Trigonometry Flashcards | StudBud
Circular Functions and Trigonometry
1 / 7
Why is the equation cos(2θ) = 1 - 2sin2θ an identity? Because...
A
It is true for only negative values of θ
B
It is true for θ 90°-180°
C
It is true for all values of θ
D
It is not true for all values of θ
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