第4题过程?
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tan(x-2y)=-3/4
tan(2x-y)=-1/3
To find : tan(x+y)
tan(2x-y) - tan(x-2y) = -1/3 +3/4
tan(2x-y) - tan(x-2y) = 5/12
[tan(2x-y) - tan(x-2y)]/( 1+tan(2x-y).tan(x-2y)] = (5/12)/(1 + (-3/4)(-1/3) ]
[tan(2x-y) - tan(x-2y)]/( 1+tan(2x-y).tan(x-2y)] = 1/3
tan[ (2x-y)-(x-2y) ] =[tan(2x-y) - tan(x-2y)]/( 1+tan(2x-y).tan(x-2y)] = 1/3
tan(x+y) = 1/3
ans: B
tan(2x-y)=-1/3
To find : tan(x+y)
tan(2x-y) - tan(x-2y) = -1/3 +3/4
tan(2x-y) - tan(x-2y) = 5/12
[tan(2x-y) - tan(x-2y)]/( 1+tan(2x-y).tan(x-2y)] = (5/12)/(1 + (-3/4)(-1/3) ]
[tan(2x-y) - tan(x-2y)]/( 1+tan(2x-y).tan(x-2y)] = 1/3
tan[ (2x-y)-(x-2y) ] =[tan(2x-y) - tan(x-2y)]/( 1+tan(2x-y).tan(x-2y)] = 1/3
tan(x+y) = 1/3
ans: B
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