Prove the following identities
(a)(cos t)(tan t)(csc t) =1
It follows that
"\\cos t\\cdot\\tan t\\cdot\\csc t\\\\\n =\\cos t\\cdot\\frac{\\sin t}{\\cos t}\\cdot\\frac{1}{\\sin t}\\\\=\n\\frac{\\cos t\\cdot\\sin t}{\\cos t\\cdot\\sin t}=1"
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