Question

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

Answer 1

hope it's ryt............

Answer 2

Answer:

25

Step-by-step explanation:

COS A=2/5=b/h

by pythagrouse therome, we can find we can find the of p

2²+p²=5²

4+p²=25

p²=25-4

p²=21

p=√21

tanA=√21/2

4+4tan²

4+4(√21/2)²

4+4(√21)²/(2)²

4+4(21/4)

4+21

25

therefore;

4+4tan²A=25