pi/4 radians = 45 degrees.
2pi radians = 360 degrees
pi radians = 180 degrees
pi/2 radians = 90 degrees
pi/4 radians = 45 degrees
pi/3 radians = 60 degrees.
et seq.,
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1 Any number over itself equals to one
Sine(pi/2) = 1 This is 'Radian' measure of an angle. pi/2 radians = 90 degrees. When you see something like 'Sine(pi/2)' make sure your calculator is in RADIAN mode. ' NOT degree mode.
Can you please claify if you mean x=y^2/ pi*cos(x) , or x=y^2/cos(pi), since they are very different sums.
The answer is:cos (pi/2) = 0
Cos(Pi/3) is 1/2 so Cos(-Pi/3) ould be flipped over the x-axis. The answer is still 1/2.