This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Discriminant muse be nonnegative for the given equation to have real roots :
\cos^2p-4(\cos p-1)\sin~p\ge~0

Observe that \cos^2p is always nonnegative because it is square of a real number.
Also \cos p-1\le0 as |\cos p|\le1

Together imply the discriminant is nonnegative if \sin p\ge0
That means when p is in Ist or IInd quadrants, the discriminant is nonnegative : p\in(0,\pi)
very intelligent,fully intelligency answer
ty haha :D
ty haha :D means
ty := thank you for appreciation xD
no yar,u deserve for that.very impressive answer