Express each of the following in terms of trigonometric ratios of angles between 0° and 45°: cos72° - cos88° - Mathematics

Express each of the following in terms of trigonometric ratios of angles between 0° and 45°: cos72° - cos88°

Sum

cos72° - cos88°
= cos(90° - 18°) - cos(90° - 2°)
= sin18° - sin2°.

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Trigonometric Equation Problem and Solution

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