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If x+y=pi/4a n dtanx+tany=1,t h e n(n in...

If `x+y=pi/4a n dtanx+tany=1,t h e n(n in Z)` (a)`sinx=0a l w a y s` (b)when `x=npi+pi/4t h e ny=-npi` (c)when `x=npit h e ny=npi+(pi/4)` (d)when `x=npi+pi/4t h e ny=npi-(pi/4)`

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