lim_(x->0)(cosmx-cosnx)/x^2 cosmx−cosnxx2 এর মান কত?
A. (m^2-n^2)/2
B. (m^2-n^2)/-2
C. (n^2-m^2)/-2
D. n2−m2
সঠিক উত্তরঃ
B.
(m^2-n^2)/-2
Explanation: 
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