यदि tan θ =a/b है, तो (a sec θ -b cosec θ) / (a sec θ+b cosec θ) का मान क्या होगा ?

• A. (a square-b square) / (a square + b square)
• B. (b square - a square )/(b square+ a square)
• C. (a-b) / (a+b)
• D. 1