answer second question☺️☺️☺️
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TanA - 2sinA + 2cosA -1=0
TanA + 2(cosA-sinA) -(sin^2A+cos^2A)=0
TanA + 2(CosA-sinA) - (cosA-sinA) (cosA+sinA)=0
TanA + 2cosA-2sinA-cosA +Si
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