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RU-C_20-21
HSC - উচ্চতর গণিত ১ম পত্র
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অধ্যায়-০৯ঃ অন্তরীকরণ
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All Topics
lim
x
→
0
cos
7
x
−
cos
9
x
cos
3
x
−
cos
5
x
=
\lim _{x \rightarrow 0} \frac{\cos 7 x-\cos 9 x}{\cos 3 x-\cos 5 x}=
lim
x
→
0
c
o
s
3
x
−
c
o
s
5
x
c
o
s
7
x
−
c
o
s
9
x
=
কত ?
A.
1
1
1
B.
1
2
\frac{1}{2}
2
1
C.
2
2
2
D.
0
0
0
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\lim _{x \rightarrow 0} \frac{\cos 7 x-\cos 9 x}{\cos 3 x-\cos 5 x}= কত ?
