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If 1/6sintheta,costheta,tantheta are in...

If `1/6sintheta,costheta,tantheta` are in `GdotPdot,` then `theta` is equal to

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a,b,c->GP
`b^2=ac`
`cos^2theta=1/6*sintheta*tantheta`
`6cos^2theta=(sintheta*sintheta)/costheta`
`6cos^3theta=1-cos^2theta`
`6cos^(3x)+cos^2x-1=0`
`(2cosx-1)(3cos^2x+2cosx+1)=0`
`4-4(3)=-8<0`
...
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