Evaluate the trigonometric function using its period as an aid. cos (-13pi/3)

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3 years ago

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dieantwoordtourredrocks Staff answered 3 years ago

To evaluate cos (-13pi/3), we need to find the coterminal angle of cos (-13pi/3) that lies in the angle 0<=2pi. T o find the coterminal angle, we can add a multiple of 2pi : -13pi/3+3(2pi)=-13pi/3+6pi=5pi/3 Therefore: cos-13pi/3=cos5pi/3=1/2 Result: 1/2

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