MCQ · কৃষি গুচ্ছ সমন্বিত ভর্তি পরীক্ষা · ২০২৪
½ sin⁻¹(4/5) = ?
- কtan⁻¹(1/2)
- খtan⁻¹2
- গcos⁻¹(3/4)
- ঘsin⁻¹(2/5)
সঠিক উত্তর: ক) tan⁻¹(1/2)
ব্যাখ্যা
sin 2θ = 4/5 হলে cos 2θ = 3/5, tan θ = sin 2θ/(1 + cos 2θ) = (4/5)/(8/5) = 1/2।
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