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Solve. Sec2 18° - Cot2 72° -

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Question

solve.
sec²18° - cot² 72°

Solution

sec²18° - cot² 72°

= [sec (90° - 72°)]²- cot²50°

= cosec²75° - cot²72°

= 1

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Trigonometric Ratios of Complementary Angles

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