To make it easy for them BYJUS provide all the formulas on a single page. I designed this web site and wrote all the lessons formulas and calculators. Class 9 Optional Mathematics Solution 1.
Class 10 Optional Mathematics Chapters List.
If a point lies on y-axis its abscissa is zeroTherefore any point on y-axis can be taken as 0y. Class 9 Optional Mathematics Solution 1. Or tanthtanth x sinthsinth sinth sinth. Or xcot 2 a cot 2 axcosec 2 a.