Question
Download Solution PDFABCD একটি বৃত্তীয় চতুর্ভুজ হলে, cos2A – cos2B – cos2C + cos2D এর মান কত?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF⇒ ? = cos2A – cos2B – cos2C + cos2D
⇒ ? = (cos A + cos B)(cos A – cos B) + (cos D – cos C)(cos D + cos C)
বৃত্তীয় চতুর্ভুজের বিপরীত কোণগুলি পরস্পর সম্পূরক।
∴ cos2A – cos2B – cos2C + cos2D = 0
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