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Line a x+b y+p=0 makes angle pi/4 with...

Line `a x+b y+p=0` makes angle `pi/4` with `xcosalpha+ysinalpha=p ,p in R^+` . If these lines and the line `xsinalpha-ycosalpha=0` are concurrent, then `a^2+b^2=1` (b) `a^2+b^2=2` `2(a^2+b^2)=1` (d) none of these

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CENGAGE ENGLISH-STRAIGHT LINES-All Questions
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