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

\(\frac{{1 - {{\sin }^2}45}}{{1 + {{\sin }^2}45}}\) = 

1
sin2 30° 
2
2tan2​ 60° 
3
cot2 60° 
4
2cos245° 
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