Express the trigonometric ratios cosA, csc A , secA in terms of tanA.
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Answer:
Step-by-step explanation:
⇒ cos A = = 1 / √(1 + tan²A) (∵sec²A = 1 + tan²A)
⇒ cosec A = √(1 + cot²A)
= √(1 + 1/tan²A) (∵cot²A = 1 / tan²A)
= √[(tan²A + 1) / tan²A]
= √(tan²A + 1) / √(tan²A)
= √(tan²A + 1) / tan A
⇒ sec A = √(1 + tan²A) (∵sec²A = 1 + tan²A)
If not understood, take help of the worked out picture below
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