⊿ABC- এ, ∠C = 90° এবং AB = a, BC = b, এবং CA = c হয়, তাহলে (TanB - sinA + cosB) এর মান কত হবে? 

1
\( {(cb + 2ab) \over ab}\)
2
\( {c \over b}\)
3
\( {2b \over c}\)
4
\({a \over c}\)

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