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cot (sin-¹1/2) =?

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If x=√2, then what is the value of cos sin-¹tan sin-¹1/√(1+x²) ?

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tan-¹2/3 + cos-¹2/√13=?

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tan-¹+ tan-²+ tan-³ এর মান কত?

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cos (sin-¹1/4 + cos-¹1/4) এর মান কত?

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tan-¹1/7 + tan-1/8 + tan-¹1/8=?

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sin-¹x + tan-¹x +cot-¹x+ cos-¹x এর মান কত?

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tan-¹1/√3 + tan-¹√3 =?

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sec²(cot-¹3)+ cosec²(tan-¹2) =?

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Sin cot-¹ tan cos-¹x এর‌ মান কত?

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cot-¹3+ cosec-¹√5 = কত?

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কোনটি সঠিক নয়?

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sin-¹4/5+ cos-¹2/√5 equal to-

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(cosec-¹x + sec-¹x) =?

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tan-¹x + tan-¹y= tan-¹ x+y/1-xy সূত্রটি কোন শর্তে বৈধ?

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tan15° এর মান কত?

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cotA-tanA=?

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A+B+C=π/2 হলে cosec(A+B)=?

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2s=a+b+c হলেbc cos^2(A/2)+ac cos^2(B/2)=?