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Do Now

Academy Algebra II 13.3: Trig Functions of Any Angle (PC 4.4) Hw: p.870-871 (4, 6, 9, 12-15 all, 16-30 even, 37, 38) Test 13.1-13.4:TBD

Reference Angle: Given an angle Reference Angle: Given an angle . is the acute reference angle formed by the terminal side of and the horizontal axis. One of the sides of the reference angle is always the horizontal axis. Reference angles are always positive acute angles. The + or – sign depends on the quadrant. This is also true for the remaining 5 trig functions.

Reference Angle Examples Sketch the angle given. Find and sketch the reference angle. 1.) -245o 2.)

A point on the terminal side of an angle is given A point on the terminal side of an angle is given. Find the exact value of each of the 6 trig functions. 1.) (-3, 4) 2.) (-3, -3) 3.)

Use a calculator to evaluate the trig function.