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Mathematics

If cos A (cos A - 1) = 0; the measure of angle A is :
90° or 0°
90° and 0°
45° or 90°
45° and 90°

Trigonometric Identities

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Answer

cos A (cos A - 1) = 0

⇒ cos A = 0 or cos A = 1

⇒ cos A = cos 90° or cos A = cos 0°

The measure of angle A is 90° or 0°.

Hence, option 1 is the correct option.

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