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handmade
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Ai nhu cầu ib em
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lớp học tiếng Anh cô kiểu
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lớp 3A1
AI 2008 Hindustan: Evaluate integral ∫ 2/3 cos(x)/sin^2(x) dx
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Alternate way: sq root integral ∫1/√((x-α)(x-β)) dx
A box contains 8 blue & 6 red socks. What is the number of ways that 2 socks can be drawn ...
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Pantun Melayu [Sorong papan tarik papan]
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Roorkee 1976 RET 1991Hindustan: trig integral 1/(sin^2(x) cos^2(x)) dx
MP 2000 Hindustan: Evaluate ∫(tan(x)+cot(x))^2 dx
sq root integral ∫1/√...√√x dx with n √
2 ways: The following measurements were taken by an antique dealer as he weighted to the ...
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sum Find 1/1.4 + 1/4.7 +1/7.10+... +1/((3n-2)(3n+1))
2 ways: Show log b^(1/n)(a) = n logb(a)
2nd/2ways: If x^3+y^3=3axy, find dy/dx
count Show Σ k^2 = ΣΣmin(i,j) where i,j,k=1 to n
1st way: trig show sin(2x)=2tan(x)/(1+tan^2(x))=2cot(x)/(1+cot^2(x))
1st/2ways: 1+2+3+...+(n-1)+n+(n-1)+...+3+2+1 = n^2
UC Davis #16: Prove (fgh)'=f'gh+fg'h+fgh' [differentiation using the product rule]
UC Davis #1 2nd way: integral ∫1/(x^2-4) dx [integration by partial fraction]