αও β , x2-bx-b=0 এর দুইটি মূল। α4 ও β4 মূলদ্বয় বিশিষ্ট সমীকরণটি বের কর।
A ও B বিন্দু দুইটির স্থানাঙ্ক যথাক্রমে (-2,4) এবং ( 4,-5) । AB রেখা C বিন্দু পর্যন্ত এমনভাবে বর্ধিত করা হল যেন AB= 3BC হয়। C বিন্দুর স্থানাঙ্ক নির্ণয় কর।
মান নির্ণয় কর: limx→0+ 1nxcosecx
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