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A line makes angles alpha,betaa n dgamma...

A line makes angles `alpha,betaa n dgamma` with the coordinate axes. If `alpha+beta=90^0,` then find `gammadot`

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Here `cos^(2)alpha+cos^(2)(90-alpha)+cos^(2)gamma=1`
or `" "cos^(2)alpha+sin^(2)alpha+cos^(2)gamma=1`
or`" "cos^(2)gamma+1=1 or gamma=90^(@)`
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