11th CBSE Mathematics Assessment 2019

School Name: Himalaya Public School, Sector 13, Rohini, Delhi 110085 India
Time: 40 minutes
Marks: 20
Class: 11th Class
Date: 20/08/2019

NCERT 11th Class CBSE Mathematics Assessment 2019

All questions are compulsory: 

Question: 1. If Sin A = 3/5 and cos B = 9/4, O < A< π/2, O < B < π/2 find the value of Cos (A – B). [2]

Question: 2. Convert (π/8) radian into degree measure. [2]

Question: 3. Prove that: Sin 20° Sin 40° Sin 60° Sin 80° = 3/16 [4]

Question: 4. Prove that: (Cos x – Cos y)² + (Sin x – Sin y)² = 4 Sin² x–y/2 [4]

Question – 11th Mathematics Assessment 2019: 5. Prove that: tan 3x tan 2x tan x = tan 3x – tan 2x – tan x [4]

Question: 6. If tan x = -4/3, π/2 <x <π, find the value of Sine x/2, Cos x/2 and tan x/2. [4]