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The curves y=a e^x and y=b e^(-x) cut or...

The curves `y=a e^x` and `y=b e^(-x)` cut orthogonally, if `a=b` (b) `a=-b` (c) `a b=1` (d) `a b=2`

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Given,`y=ae^x `and `y=be^(−x)`
`dy/dx=m_1=ae^x`
`m_2=-be^(-x)`
as orthogonal
`m_1 xx m_2=-1`
or ab=1
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