**cos² α + sin² α = 1**

**sec² α = 1 + tan² α **

**csc² α = 1 + cot² α **

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.

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