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kortniy
@kortniy
July 2022
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Lesben
Sin x + cos 2x =0, sin x + cosˇ2 x - sinˇ2 x =0
sin x +1 -sinˇ2 x -sinˇ2 x = -2.sinˇ2 +sin x +1 =0
2.sinˇ2 x - sin x - 1=0
sin x =t, 2.tˇ2 -t-1=0
t1=1,t2=-1/2
a)sin x = 1, x= pí/2 +2k.pí
b)sin x = -1/2, x = 7/6.pí + 2k.pí
x=11/6.pí + 2k.pí
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Answers & Comments
sin x +1 -sinˇ2 x -sinˇ2 x = -2.sinˇ2 +sin x +1 =0
2.sinˇ2 x - sin x - 1=0
sin x =t, 2.tˇ2 -t-1=0
t1=1,t2=-1/2
a)sin x = 1, x= pí/2 +2k.pí
b)sin x = -1/2, x = 7/6.pí + 2k.pí
x=11/6.pí + 2k.pí