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ample 24 Solve 2 cos23 sin x 0 |
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Answer» 2cos^2x+3sinx=02(1-sin^2x)+3sinx=02-2sin^2x +3sinx=02sin^2x -3sinx -2=02sin^2x -4sinx+sinx-2=02sin x(sin x-2)+1(sinx-2)=0(sin x -2)(2sin x+1)=0sin x - 2=0 or 2 sin x+1=0sin x =2 or sin x = -1/2 |
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