I'm having some problems figuring this out, should I do substitution and then integration by parts? or just substitution, I am a bit lost as to how to approach it and sadly our Friday quiz is going to look similar to this. any help is very appreciated , thank you!

Integral (a= -pi/2, b=0) tan x sq.root(cos x) dx

Sorry about problem presentation, don't know how to math tag sq. root or integral