if 29 cos∅=20,find sec²∅-tan²∅
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cos =adjacent /hypotenuse
so adja=20. hypo=29..
by Pythagoras theorem H^2=O^2+A^2
841=O^2+400
O^2=441
O=21
sec=29/20
tan=21/20
then substitute...841/400. -441/400
400/400=1
so adja=20. hypo=29..
by Pythagoras theorem H^2=O^2+A^2
841=O^2+400
O^2=441
O=21
sec=29/20
tan=21/20
then substitute...841/400. -441/400
400/400=1
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