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Help with Trigonometric identities

Help with Trigonometric identities-example-1
User Loathing
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1 Answer

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Answer:

Option 2

Explanation:

Since theta is in the third quadrant, the sine of theta is negative.

By the Pythagorean identity,


\sin \theta=-(√(105))/(13)

So, using the double angle formula for sine, we get that


\sin 2\theta=(16√(105))/(169)

User David Siro
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