Evaluate sin 18 -cos 72 -

sin 18 ^ ∘cos 72 ^ ∘ = sin 18^0 cos ( 90 18) = sin 18^0 sin 18^0 = 1 ...

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Complementary Trigonometric Ratios

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Question

Evaluate $\frac{sin 18^{\circ}}{cos 72^{\circ}}$ .

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