# SOLUTION: How do you express functions in terms of the same function which has a positive acute angle.

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 Click here to see ALL problems on Trigonometry-basics Question 454530: How do you express functions in terms of the same function which has a positive acute angle.Answer by stanbon(57967)   (Show Source): You can put this solution on YOUR website!How do you express functions in terms of the same function which has a positive acute angle. ---- You need a reference angle, and you need the sign of the original function. ---- Example: sin(220 degrees) -- The sign is negative because sin is negative in the 3rd Quadrant. ----- The reference angle is the acute angle between the terminal side of 220 degrees and the closest segment of the x-axis. That angle is 220-180 = 40 degrees. --- So sin(220) = -sin(40) ============================= Cheers, Stan H.