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Trigonometric Ratios of Compound Angles

prove that:ta...

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prove that:tan 40 degrees +2.tan 10 degrees=cot 40 degree

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Q. Evaluate sec theta cosec 90 degree minus theta minus 10 theta cot 90 degree minus theta + sin square 35 degree + sin square 55 degree / tan10 degree tan20 degree tan45 degree tan70 degree tan80 degree

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