Cotangent : কোণপূরকের স্পর্শরেখা;
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Appropriate Prepositions
Careful of (সতর্ক): He is very careful of his fault.
Contribution to (অবদান): His invention made a major contribution to road safety.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Informed of (অবহিত): I was not informed of your misfortune.
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Idioms
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Out of date (সেকেলে): This fashion is out of date.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.