Question

If cos A = 2/5,find the value of 4+4 tan2 A.

Plz help me...........

Answer 1

✌✌hey here is ur ans ....✌✌

cos A = b/h = 2/5

by pythagoras theorem ....

${h}^{2} = {b}^{2} + {p}^{2}$

${5}^{2} = {2}^{2} + {p}^{2}$

${p}^{2} = 25 - 4$

$p = \sqrt{21}$

tan A = p/b

$\tan(a) = \sqrt{21} \div 2$

=> 4+ 4tan^2A

=> 4+ 4× 21/4

=> 25

hope it will help uh ..

nd plz mark as brainliest ..☺☺

Answer 2

hope it's helpfull for you