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Trigonometric Ratios of Compound Angles

Evaluate : Ta...

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Evaluate : Tan 70°-tan 20°divided by tan 50°.

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sin (50^{o} + θ) - cos (40^{o} - θ) + tan 1^{o} tan 10^{o} tan 20^{o} tan 70^{o} tan 80^{o} tan 89^{o}

tan 70^{0} = a tan 50^{0} + tan 20^{0}

tan 70^{o} - tan 20^{o} = 2 tan 50^{o}

tan 70^{\circ} = tan 20^{\circ} + 2 tan 50^{\circ}

tan 70^{o} - tan 20^{o} = 2 tan 50^{o}

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Trigonometric Ratios of Compound Angles

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