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24 January, 22:41

Let cos (-θ) = -3/5 and tanθ>0.

What is the value of sin (-θ) ?

A. - 4/5

B. 4/3

C. - 3/5

D. 4/5

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Answers (1)
  1. 25 January, 02:21
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    A

    Step-by-step explanation:

    The cosine of a right triangle is the adjacent over the hypotenuse. If the cosine is - 3/5 then it must be a right triangle with sides 3, 4, & 5 since this is a Pythagorean triple. This means the sin will be - 4/5. We know its negative because the tangent is positive so this is the 3rd quadrant where both Sine and Cosine are negative.
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