Question

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

Answer 1

4(1+tan²A)=4sec²A=4/cos²A=4/(4/25)=25

Answer 2

4 + 4 tan^2A
4(1+ tan^2)
4 × sec^2
4 × 1/cos ^2
4 × 1/2^2/5^
25 ans....
I hope it help you