====== Question 10(xi-xv), Review Exercise ====== Solutions of Question 10(xi-xv) of Review Exercise of Unit 09: Trigonometric Functions. This is unit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textbook Board, Islamabad, Pakistan. =====Question 10(xi)===== ** Solution. ** =====Question 10(xii)===== ** Solution. ** =====Question 10(xiii)===== ** Solution. ** =====Question 10(xiv)===== ** Solution. ** =====Question 10(xv)===== ** Solution. ** ====Go to ==== [[math-11-nbf:sol:unit09:Re-ex-p9|< Question 10(vi-x) ]]