(iii) The ages of Jatin, Nitin and Mohasin are 16. 24 and 36 years respectively. What is the ratio
of Nitin's age to Mohasin's age ?
(A) 3 : 2 (B) 2:3 (C) 4:3 (D) 3:4​

Using two or more complete sentences, describe how you can find a vector parallel to b=-2,3

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota