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4Sin x – 4 (1 – sin2x ) = -1
4 sin x – 4sin2 x + 1 = 0
let sin x be K
4k2 + 4k – 3 = 0
(2k-1)(2k+3) = 0
2k = 1 or 2k = -3
k = ½
sin x = ½
x = 30, 15.0
Kavungya answered the question on November 15, 2019 at 05:27
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