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Mathematics 19 Online
OpenStudy (sleepyjess):

@Nnesha

OpenStudy (sleepyjess):

Find \(\large\sf sin\theta~ if ~cot\theta~ =~ -2 ~and ~cos\theta~ <~ 0.\)

OpenStudy (danjs):

\[\cot(x) = \frac{ \cos(x) }{ \sin(x) }\]

OpenStudy (danjs):

\[-2*\sin(x) = \cos(x)\]

OpenStudy (danjs):

sin(x) = -(1/2) cos(x)

OpenStudy (phi):

draw a triangle in the correct quadrant.|dw:1418577682291:dw| It helps to remember that cos can be thought of as the "x value" and sin as the "y value"

OpenStudy (phi):

notice that the easiest way to get x/y = -2 is make x -2, and then y=1 with those numbers, figure out they hypotenuse. you get sqr(1^2 + (-2)^2) = sqr(5) now you can write down the sin or cos. sin = y/hyp

OpenStudy (sleepyjess):

Thank you all for the help!

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