Question

If cos A is equals to 2 by 5 find the value of 4 + 4 tan square A

Answer 1

hello there!!!!

cosA=2/5

4+4tan²A=4(1+tan²A)= 4sec²A=4×1/cos²A=4×1/(2/5)²=4×25/4=25

Answer 2

cosA=2/5 cos A=b/h by Pythagoras s theorem p=
$\sqrt{21}$
4+4tan square 4+4× route 21 /2