Given tan θ = − 2 3 and sin θ > 0, find cos θ

Nazlee R. answered • 12/15/20

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I'm thinking you meant tan - 2/3. Sin is positive so cosine is negative.

tan x = sin x/cos x

tan is opp/adj. so hypotenuse is sqrt. 13

cos x = -3/sqrt. 13

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