trigonometric functions using identities

Finding the values of other trigonometric function using identities. 1.) sin = negative two over three, cos = square root of five over three
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tan=sin/cos=-⅔/(√5/3)=-2/√5 which can also be written -2√5/5.

sec=1/cos=3/√5 which can be written 3√5/5.

csc=-3/2.

cot=-√5/2.
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