Question

If 4tan A=3,Find the value of Cos A
answer is 4/5​

Answer 1

Answer:

Cos A = 4/5

Step-by-step explanation:

Given :-

tanA = 3/4

tan²A = 9/16

tan²A + 1 = 9/16 + 1 adding 1 both side

sec²A = 9+16/16 tan²A + 1 = sec²A

sec²A = 25/16

secA = 5/4 cosA = 1/secA

cosA = 4/5

Answer 2

Answer:

Step-by-step explanation:

We know that, sec^2A-tan^2A=1

So sec^2 A= 1+tan^2 A

=1+(3/4)^2

=1+(9/16)

=25/16

sec A= 5/4

cos A=1/sec A=4/5