First order linear differential equation

Calculus Level 1

Suppose that yy satisfies the equation y+ytanx=secx.y'+y\tan x=\sec x.
y(π4)=12.y\left (\dfrac{\pi}{4}\right) = \dfrac{1}{\sqrt{2}}.

What is the value of y(π2)?y\left (\dfrac{\pi}{2}\right)?

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