Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 Quantitative Aptitude Trigonometry

If tan A + sin A = m and tan A - sin A = n then: 

1
m2 + n2 = 2mn
2
m2 + n2 = mn
3
\(m^2 - n^2 =4 \sqrt {mn}\)
4
\(m^2 - n^2 = \sqrt {mn}\)
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