If secθ + cosθ= 2, find the value of $sec^{55}θ+\frac{1}{sec^{55}θ}$.
Answer & explanation
Correct answer: option 1
secθ + cosθ= 2
cosθ + \(\frac{1}{cosθ }\) = 2
cos2θ+ 1 = 2cosθ
on solving ,
cosθ = 1
So , θ = 0º
Now , sec55θ + \(\frac{1}{sec55θ }\)
put θ = 0º
= sec550º + \(\frac{1}{sec550º }\) = 1 + 1 = 2