SOLUTION: tanA = a/b, a>0, b>0 & 0 < A < pi/2 What is cosA? explain answer please thanks :)

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Question 982115: tanA = a/b, a>0, b>0 & 0 < A < pi/2 What is cosA? explain answer please thanks :)
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!




by definition of the tangent function.



is given.









by the Pythagorean Identity









Since ,

Hence



John

My calculator said it, I believe it, that settles it