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rcos@=2root3
rsin@=2
so rsin@/rcos@=tan@=2/2root3=1/root3=tan30
ap @=30
again r^2cos^@=4*3=12
and r^2sin^2@=4
so r^2 (cos^2@+sin^2@)=12+4=16
or r^2=16
or r =+- 4
and @=30 degrees
rsin@=2
so rsin@/rcos@=tan@=2/2root3=1/root3=tan30
ap @=30
again r^2cos^@=4*3=12
and r^2sin^2@=4
so r^2 (cos^2@+sin^2@)=12+4=16
or r^2=16
or r =+- 4
and @=30 degrees
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