MCQ · ঢাকা বিশ্ববিদ্যালয় ভর্তি পরীক্ষা · ২০২২
cosec10° − 4 sin70° এর মান কত?
- ক−1
- খ1/2
- গ−2
- ঘ2
সঠিক উত্তর: ঘ) 2
ব্যাখ্যা
= (1 − 2·2sin70°sin10°)/sin10° = (1 − 2(cos60° − cos80°))/sin10° = 2cos80°/cos80° = 2 (কারণ sin10° = cos80°)।
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