Question

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

Answer 1

4 tanA+4tan^2=23√21
I think soo

Answer 2

given

cosA =2/5

we know that

(1+tan^2 )= sec^2

and,

sec^2 =1/cos

here,

4+4=4 (1+tan ^2 A)

=4×sec^2
=4/cos ^2
=4×( 5/2) ^2
=4×25/4
=25 ans