allery1 − cos²θ রাশিটি কোনটির সমান?
A1
Bsin²θ
Ccos²θ
Dtan²θ
Answer & Solution
Correct answer: B. sin²θ
sin²θ + cos²θ = 1 সমীকরণটি পুনর্বিন্যাস করলে sin²θ পাওয়া যায়।
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