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tansq.@+cotsq.@+2
=secsq.@-1+cosecsq.@-1+2
=secsq.@+cosecsq.@
HENCE PROVED.
CONSIDER @ IN PLACE OF THETA.
=secsq.@-1+cosecsq.@-1+2
=secsq.@+cosecsq.@
HENCE PROVED.
CONSIDER @ IN PLACE OF THETA.
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