When asked for exact values you MUST draw each angle on the Cartesian Plane identify the related acute angle and drav the special triangle or use the unit circle Determine the exact value for the expression using a compound angle formula 5 5 12 12 COS T COS 4 sin T 4 sin compound angle formula cos A B COSA COSB Cos TT cos 577 12 sinA sin B sin sin 5 12 A 4 B 57 12 Cos 4 5 12 cos 3