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- y = f(x) সন্তত বক্রের ওপর P(a, b) বিন্দুতে অঙ্কিত স্পর্শকটি
x অক্ষের সমান্তরাল হলে ওই স্পর্শকটির সমীকরণ কি হবে?​

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