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Evaluate: Tan(55° - A) - Cot(35° + A) -

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Question

Evaluate:

tan(55° - A) - cot(35° + A)

Solution

tan(55° - A) - cot(35° + A)

= tan[90° - (35° + A)] - cot(35° + A)

= cot(35° + A) - cot(35° + A)

= 0

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Trigonometric Ratios of Complementary Angles
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