Cotangent : কোণপূরকের স্পর্শরেখা;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Free from (মুক্ত): He is now free from danger.
Indulge in (আসক্ত): You should not indulge in social media.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.
Without fail (অবশ্যই) - You must attend the meeting without fail.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.