The Total solution for NCERT class 6-12
Answer - 11 : -
Answer - 12 : - माना y= cot (tan-1 a + cot-1 a)
Answer - 13 : -
Answer - 14 : -
Answer - 15 : -
Answer - 16 : -
Answer - 17 : -
Answer - 18 : -
Answer - 19 : -
Answer - 20 : -