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

निम्नलिखित को पूरा कीजिए

\(\bigtriangleup\)ABC cos(B + C)/2 = ? 

1
Cos A
2
SinA/2
3
Sin A + B /2
4
Cot B 
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