Question

If Cos A = 2/5, find the value of 4 + 4 tan^2A​

Answer 1

Answer:

25

Step-by-step explanation:

cos A=2/5

By Pythagoras Theorem

Perpendicular=\/(5^2 -2^2)

                       =\/(25-4)

                       =\/(21)

tan A=\/(21)/2

tan^2 A=21/4

4+4tan^2 A=4 + 4(21/4)

                  =4+21

                  =25