Pythagorean Identities
cos² α + sin² α = 1
sec² α = 1 + tan² α
csc² α = 1 + cot² α
Examples
Knowing that sin α = 3/5, and 90º < α <180°. Calculate the remaining trigonometric ratios of angle α.
Knowing that tan α = 2, and 180° < α <270°. Calculate the remaining trigonometric ratios of angle α.
