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If sin theta + cos theta = sqrt(2), then...

If `sin theta + cos theta = sqrt(2)`, then `tan theta=`

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`sintheta+costheta=sqrt2`
squaring both side
`(sintheta+costheta)^2=2`
`sin^2theta+cos^2theta+2sinthetacostheta=2`
`1+2sinthetacostheta=2`
`2sinthetacostheta=1`
`(2sinthetacostheta)/cos^2theta=1/(cos^2theta)`
`2tantheta=1+tan^2theta`
...
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