Trigonometry/Identities/Quiz

{Dividing the Pythagorean equation by which variable produces $$cos^2\theta+\sin^2\theta=1$$? - $$x^2$$ - $$y^2$$ + $$r^2$$
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{Dividing the Pythagorean equation by which variable produces $$\cos^2\theta+1=\csc^2\theta$$? - $$x^2$$ + $$y^2$$ - $$r^2$$
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{Dividing the Pythagorean equation by which variable produces $$1+\tan^2\theta=\sec^2\theta$$? + $$x^2$$ - $$y^2$$ - $$r^2$$
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{ \cos^2\theta + \sin^2\theta = { 1 _1 }
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{\cot^2\theta + 1 = - $$\sin^2\theta$$ - $$\sec^2\theta$$ + $$\csc^2\theta$$
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{ \csc^2\theta - \cot^2\theta = { 1 _1 }
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{1 + \tan^2\theta = - $$\sin^2\theta$$ + $$\sec^2\theta$$ - $$\csc^2\theta$$
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{ \sec^2\theta - \tan^2\theta = { 1 _1 }
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{1 - \cos^2\theta = + $$\sin^2\theta$$ - $$\sec^2\theta$$ - $$\csc^2\theta$$
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{1 - \sin^2\theta = - $$\sin^2\theta$$ - $$\sec^2\theta$$ + $$\cos^2\theta$$
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