Write the least value of cos2 x + sec2 x.
We know that cos2x and sec2x ≥ 0
∴ By applying AM and GM we get,
⇒ 
⇒ cos2 x + sec2 x≥2
∴ Least value of the given function is 2.
1
Write the least value of cos2 x + sec2 x.
We know that cos2x and sec2x ≥ 0
∴ By applying AM and GM we get,
⇒
⇒ cos2 x + sec2 x≥2
∴ Least value of the given function is 2.