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tan# + sin# = m........... (1)
tan# - sin# = n,............. (2)
(1) নং ও (2) নং বিয়োগ করে পাই
2sin# = m - n
বা, sin# = (m - n)/2
এখন, sin2#/cos# = 2sin# cos#/cos#
= 2sin#
= 2. (m - n)/2
= m - n (ans)
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