Question

Find all solutions in radian [0,2pi) solve 4sinx= -cos^2x +4

Answer 1

I hope this helps you


-cos²x= sin²x-1


4.sinx = sin²x-1+4


sin²x-4.sinx +3=0


(sinx-3)(sinx-1)=0


sinx≠3


sinx =1


SİN90=1