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[" EXAMPLE 6If the straight line ax + by...

[" EXAMPLE 6If the straight line ax + by + "c=0" and "],[x cos alpha+y sin alpha=c," enclose an angle "pi/4" between them and meet "],[" the straight line "x" sin "alpha-y cos alpha=0" in the same point,then "],[[" (a) "a^(2)+b^(2)=c^(2)," (b) "a^(2)+b^(2)=2],[" (c) "a^(2)+b^(2)=2c^(2)," (d) "a^(2)+b^(2)=4]]

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