Solve `4sin^2theta+4costheta=5` on `0 <= theta <= 360`
Use the pythagorean identity:
`4(1-cos^2theta)+4costheta=5`
`4-4cos^2theta+4costheta-5=0`
`4cos^2theta-4costheta+1=0`
`(2costheta-1)^2=0`
`=>costheta=1/2`
On `0<theta<360` `costheta=1/2 => theta=60"or"300`
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Thus the solutions are `theta=60` degrees or `theta=300` degrees.
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