sin? 0 = 1 – cos² 0 -1-() V3 =1 - 25 25 sin 0 = ± 20 sin 0 = The given expression of cosine is positive and tangent function is given to be less than 0, that is, negative, thus 0 must lie in quadrant IV. Now, take the negative value of the square root, because 0 is in quadrant IV and sine function is negative in quadrant IV. The value of sin 0, when cos (–Ø) tan 0 < 0, is – 2v3

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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.