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21 June, 21:09

Find the exact value of sin (-0) when cos (-0) = 3/5 and tan 0<0

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  1. 21 June, 22:23
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    sin (θ) = - 4/5

    Step-by-step explanation:

    tan (θ) < 0 means the sine and cosine have opposite signs. The relation between sine and cosine is ...

    sin (θ) = ±√ (1 - cos (θ) ²) = ±√ (1 - (9/25)) = ±√ (16/25)

    We want the negative square root, since the cosine is positive:

    sin (θ) = - 4/5
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