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24-07-2018
Mathematics

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Trigonometry Identities help please

Trigonometry Identities help please class=

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Аноним Аноним

24-07-2018

theta is in the fourth quadrant where the cosine is positive.

the third side in the triangle = sqrt (4 - 2) = sqrt2

So sin theta = -sqrt2/2 = Second choice (negative because sine is negative in 4th quadrant)

tan theta = - sqrt2 / sqrt2 = -1

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