Posted by Carol on Monday, January 3, 2011 at 3:58pm.
lets check it at x=0, and x=PI/2
x=0: 1/4(1+2)=1/12
(-sin45/(2sin45+cos45)=-.707/(1.414+.707) does not equal 1/12
that was at x=90 deg, the identity did not hold. Now at x=0
1/4(0+2)=1/8
-0/(0+.7) does not equal 1/8
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