cos 17+ sin 17\cos17-sin17=tan62
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cos(17°) + sin(17°)]/[cos(17°) - sin(17°)] = [cos(17°) + sin(17°)]²/{[cos(17°) - sin(17°)][cos(17°) + sin(17°)]} = [cos²(17°) + sin²(17°)
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