state gov TSPSC Forest Beat Officer (ఫారెస్ట్ బీట్ ఆఫీసర్) Mock Test 2023 Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
If cot A + cos A = m and cot A - cos A = n, then:
1
(m2 - n2)2 = 4 mn
2
(m2 - n2)2 = 16 mn
3
m2 - n2 = 16 mn
4
m2 + n2 = 4 mn