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Point $\mathrm{M}(-5 ;-12)$ is a point on the Cartesian plane and reflex of $\mathrm{XO} M=\theta$.
Calculate the following without the use of a calculator.

(a) $\cos \theta$

(b) $1-\sin ^2 \theta$

(c) $\frac{\sin \theta}{\tan \theta}$

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