ll}. Estimate the percentage change in the function x) = 3x + as x decreases from 5 to 4.6. x 1. Use a half-angle formula of sine, cosine, and tangent to find the exact value of each expression. 2. Show your solution and box your final answer. (5pts each) 3. If your answer is in radical form, leave it as radical form, simplify if necessary. 1. tan A = 2 @ Quadrant 1 Find sin A/2 2. cot A = -3v91 / 91 @ Quadrant 4 Find sin A/2 3. cos A = 4 / 5 @ Quadrant 4 Find cos A/2 4. sin A = -7 / 25 @ Quadrant 4 Find cos A/25. tan 8 = - and ("