Question

Q = theta

If secQ - tanQ = 3, then the value of cosQ, is

a)3/5

b)3/10


c)2/3

d)1/3

Answer 1

a) 3/5 . since (secQ + tanQ)*(secQ - tanQ) = 1 =3(secQ+tanQ)
hence secQ+tanQ =1/3
on solving secQ=5/3 hence cosQ=3/5