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=∫(1-2sin²x-2sinxcosx)/(sinx+cosx)dx
=∫1/√2sin(x+π/4)-2sinxdx
=1/√2∫csc(x+π/4)dx+2cosx
=(1/√2)ln|csc(x+π/4)-cot(x+π/4)|+2cosx+C
=∫1/√2sin(x+π/4)-2sinxdx
=1/√2∫csc(x+π/4)dx+2cosx
=(1/√2)ln|csc(x+π/4)-cot(x+π/4)|+2cosx+C
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