Cotangent : কোণপূরকের স্পর্শরেখা;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Relation with (সম্পর্ক): I have no relation with the culprit.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.