v) একটি ঘরের দৈর্ঘ্য, প্রস্থ ও উচ্চতা যথাক্রমে a, b, c একক হলে, তার চার
দেওয়ালের ক্ষেত্র কত?
vi) (x+1)2 = r+K+49, হলে K=?
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In spherical trigonometry, the law of cosines is a theorem relating the sides and angles of spherical triangles, analogous to the ordinary law of cosines from plane trigonometry
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IAM NOT ABLE TO UNDERSTAND THIS LANGUAGE
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