railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
In right triangle ABC, 90° at C the sides are in the ratio 1 : 1 : √2.Then find the value of cos A cos B – sin A sin B
1
1
2
0
3
1/2
4
1/√2