Do you have the answers for the "try these" questions in NCERT math 8 textbook for chapter 1?
. question no. 19
please solve question 18
prove that cosx + sinx/cosx - sinx = tan(pie/4) hence solve cos18° + sin18°/cos18° - sin18° = tan63°
differentiate tan inverse under root (1-cosx)/(1+cosx)