\(sin\theta-cos\theta=0\) হলে \(sec\theta-cosec\theta=?\) (a) 1 (b) \(2\sqrt2\) (c) 2 (d) 0
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Answer: D
\(sin\theta-cos\theta=0\)
বা, \(\cfrac{1}{cosec\theta}-\cfrac{1}{sec\theta}=0\)
বা, \(\cfrac{sec\theta-cosec\theta}{cosec\theta sec\theta}=0\)
বা, \(sec\theta-cosec\theta =0\)
\(sin\theta-cos\theta=0\)
বা, \(\cfrac{1}{cosec\theta}-\cfrac{1}{sec\theta}=0\)
বা, \(\cfrac{sec\theta-cosec\theta}{cosec\theta sec\theta}=0\)
বা, \(sec\theta-cosec\theta =0\)