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Question:
cos 70° -cos10° + sin40° এর মান কত?
a)
0
b)
1
c)
2
d)
10
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Description:

cos70° -cos10° +sin40° = -2sin40°sin30° + sin40°

=-sin40° +sin40°

=0

This question was added in the model test of V A Math 1st Chap 7

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