Question

1. If cos A=4/5,then the value of tan A is
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Answer 1

Step-by-step explanation:

see answer in above attachement

Answer 2

Draw a triangle, mark its base as 4 and hypotenuse as 5.

Based on Pythagoras theorem, a2+b2=c2

a2+4^2=5^2

a2=9

a=3

Now we have all three sides of the triangle, so we can find tanA as

opp/adj

or

perpendicular/base

= 3/4