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Question
Calculate the value of A, if (sin A - 1) (2 cos A - 1) = 0
Sum
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Solution
( sin A – 1) ( 2 cos A – 1) = 0
(sin A – 1) = 0 and 2 cos A – 1 = 0
sin A = 1 and cos A = `(1)/(2)`
sin A = sin90° and cos A = cos60°
A = 90° and A = 60°
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Trigonometric Equation Problem and Solution
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Chapter 21: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals] - EXERCISE 21 (E) [Page 328]
