Cos(90 - x) = sin(x)
so cos2(90 - x) = sin2(x)
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cos pi over four equals the square root of 2 over 2 This value can be found by looking at a unit circle. Cos indicates it is the x value of the point pi/4 which is (square root 2 over 2, square root 2 over 2)
It would be 1 over square root 5.
sec(x)=1/cos(x), by definition of secant.
cos(60) = 0.57 x 60 x cos(60) = 7 x 30 = 210
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