89 94 Trigonometric Substitution Make the indicated trigonometric substitution in the given algebraic expression and simplify see Example 7 Assume that 0 0 TT 2 90 V1 x x tan 0 89 X x sin 0 V1 x 91 Vx 1 x sec 0 93 V9 x x 3 sin 0 92 94 1 x 4 x x 25 2 X x 2 tan 0 x 5 sec 0