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How Do You Solve Cos3Pi? [Solved]
The value of cos 3pi can be calculated by constructing an angle of 3π radians with the x-axis, and then finding the coordinates of the corresponding point (-1, 0) on the unit circle. The value of cos 3pi is equal to the x-coordinate (-1). ∴ cos 3pi = -1.
Cos 3pi/4
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Compute cos(3pi/2) using the unit circle
Compute
Poland international Mathematics Olympiad | prove cos(pi/7)+cos(3pi/7)+cos(5pi/7)=1/2
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