Please do not use technology on this one. Only EXACT answers are sought. (a) Calculate sin 45◦ and cos 45◦ exactly. Use the fact that the point P corresponding to 45◦ is on the unit circle, x2 + y2 = 1. (b) Find the exact value of cos(135◦). (c) Find the exact value of tan(225◦).

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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.