Word Count : 92

---

The complementary (homogeneous) equation $y''+y=0$ has solutions $y_1=\cos x,\;y_2=\sin x$, so $y_c=C_1\cos x+C_2\sin x$. Use variation of parameters for $y''+y=\sec^2x$. The Wronskian $W=y_1y_2'-y_1'y_2=\cos _________ _____ _______ _______ _____ _____ __________.
___ _______ _______ _____ _____ _______.
_____ _____ ________ __________ ___ ______ ___ ___.
_________ ______ _____ _____ ____ _________ _________.
_____ _______ ______ __________ _________ _____ _______ ________.
__________ _________ _______ _________ _____ ___ __________ ___ _____ ________ ___.
_____ ___ ____ ___ _____.
__________ _________ _________ ______ ________ ___ ___ _________.
_______ ____ ___ ________ _________ ____ ___ ______.
_______.
Get Full Answer on WhatsApp