Can you tell me if I'm getting the right answers for -7π/4? Also, what am I supposed to say for the co-terminal of 11π/6 when I have to be between 0 and 2π? Is it just 11π/6 or is it different?

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Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.