Question

If sin (A) = 5/8 with A in QII, find sec (2A).

Answer 1

sec(2A)=1/cos(2A)

Answer 2

and
cos(2A)=1-2sin^2(A)

Answer 3

can u do it now???

Answer 4

actually...i worked on it I just didnt get the right problem

Answer 5

I got \[\frac{ 8\sqrt{2} }{ 5}\]

Answer 6

follow me

Answer 7

cos(2A)=1-2*(sinA)^2

Answer 8

sinA=5/8
(sinA)^2=??

Answer 9

ok let me work it out...

Answer 10

okk

Answer 11

7/32?