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  3. given sec 0= 19, use trigonometric identities to f

Given sec 0= 19, use trigonometric identities to find the exact value of (a) cos...

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Given sec 0= 19, use trigonometric identities to find the exact value of (a) cos 0, (b) tan 20, (c) csc (90-0), and (d) sin 20.

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