Let sin t = a, cos t=b, and tant=c. Write the expression in terms of a, b, and c. 12 cos (-t)- cost 12 cos (- t) - cost= (Simplify your answer.)

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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.