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If the vectors a hati + hatj + hatk, hat...

If the vectors `a hati + hatj + hatk`, `hati + b hatj + hatk` and `hati + hatj + chatk` are coplanar where `a ne 1`, `b ne 1`, `c ne 1`, prove that `1/(1-a)+1/(1+b)+1/(1-c) = 1`.

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UNITED BOOK HOUSE-SET 15-EXERCISE
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  2. Solve:(x+y+1)dx + (2x+2y-1)dy = 0

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