JEE Main 2026 Mathematics question

MathematicsApplication of DerivativesJEE Main 2026

For the functions f(θ)=α tan²θ+β cot²θ and g(θ)=α sin²θ+β cos²θ, α>β>0, let . If the first term of a G.P. is (α/2β), its common ratio is (2β/α) and the sum of its first 10 terms is m/n, gcd(m,n)=1, then m+n is equal to .

Answer: 1279

Solution

By AM–GM, min f=2√(αβ); since α>β, max g=α (at θ=π/2). So 2√(αβ)=α, giving α=4β.

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Question ID VK-015658