Solve: 4 sinx COSX + 2 sinx + 2 COSX + 1 = 0.
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0
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4sinxcosx+2sinx+2cosx+1=0
2sinx(2cosx+1)+1(2cosx+1)=0
(2cosx+1)(2sinx+1)=0
cosx=
2
−1
(or)sinx=
2
−1
x=−30
o
or120
Answered by
2
4sinxcosx+2sinx+2cosx+1=0
2sinx(2cosx+1)+1(2cosx+1)=0
(2cosx+1)(2sinx+1)=0
cosx= -1/2 (or) sinx= -1/2
x=−30°
or 120°
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