Cotangent : কোণপূরকের স্পর্শরেখা;
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Appropriate Prepositions
Abide with(সঙ্গে থাকা): If you would like to rest for a while, you can abide with me.
Admit to(ভর্তি করা): The boy was admitted to class Nine.
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Attentive to(মনোযোগী): He is attentive to his business.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.