If 2sin A - 1 = 0 and A is an acute angle, the measure of angle A is :
30°
45°
60°
90°
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If A = B = 45°, show that :
sin (A - B) = sin A cos B - cos A sin B
cos (A + B) = cos A cos B - sin A sin B
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°
If tan4 A - 1 = 0 and angle A is acute, then A is :
± 45°
± 30°