secant (square) 90-tan(square)90 is not equal to one ...why???
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We know that, sec²∅-tan²∅=1
Also, tan90° = Infinity or Not Defined
So tan²90° = Infinity or Not Defined
And, sec90°= Infinity or Not Defined
Therefore,
sec²90° - tan²90°
= Infinity or N.D. - Infinity or N.D.
= 0
Hope it helps...
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yes but as for trigonometric identity this answer is invalid
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