Cotangent : কোণপূরকের স্পর্শরেখা;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Dressed in (সজ্জিত, পরিহিত): The girl was dressed in silk.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.