Question

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

Answer 1

COSA = 2/5= b/h
b= 2, h = 5 ,p = ?
We know that,
h²= (p)²+(b)²
(p)²=(h)²-(b)²
(p)²=25- 4 = 21
p= ✓21cm
tanA= p/b= ✓21/2
Therefore,
the value of 4+4tanA
is = 4+4(✓21/2)... solve this u will get ur answer