7. The value of tan-1 x + cot-1 x when a. xe [-] b. x € +R d. x € (-) С. хER 8. For x € [-1,1], sin¬(-x) is equal to a. - sin-1 x b. T + sin-1 x C. IT - sin-1x d. sin-1x 9. What is the value of cos 13т ¬ (cos 6 d. 13л b. 6 a. С. 6 6

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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.