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

Question 982115: tanA = a/b, a>0, b>0 & 0 < A < pi/2 What is cosA? explain answer please thanks :)
Answer by solver91311(24713) (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

RELATED QUESTIONS
given that cosA=-7/25, where Pi/2 (answered by lwsshak3)
pls. help me solve this problem.. thank you so much. verify each of the following... (answered by lwsshak3)
(i) Show that [(cosA+sinA)^2]/[sec^2(A)+2tanA]=cos^2(A) (ii) Hence find all values of A, (answered by sandeepvijay)
If A is an angle such that tanA+secA=2, evaluate... (answered by stanbon,ikleyn,MathTherapy)
Which identity could be used to transform the expression on the left to the one on the... (answered by lwsshak3)
What is the domain and range of the function f( x)=sin^-1 (x) The correct answer is one (answered by MathLover1)
Find the exact value of the following given the conditions, I was able to find cos (A+B): (answered by jsmallt9)
Please help me find answer to the question: Given two points A (0, 0) and B (6, 0). What... (answered by josgarithmetic)
Find sinA, cosA, and tanA of the following triangle. Line AC=2 Line AB=4 Angle C is a (answered by Edwin McCravy,bucky)