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alternate way: count sum 1+3+5+ ... +(2n-1)
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RPET 2003 Hindustan: integral ∫sin^4(x)-cos^4(x) dx
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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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3 picture views of the sum ... 1+2+3+...+n
2 ways: integral ∫x/(x+a) dx
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sq root integral ∫1/√√x dx
1st/2 parts: Inverse 2x2 matrix
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2 ways of "counting" (a+b)^2 = a^2+2ab+b^2
1st/2 ways: hyper trig exp integral ∫e^x (1+tanh(x)-tanh^2(x)) dx
trig integral ∫arc sin(x)/√(1-x^2) dx vs ∫1/(arc sin(x) √(1-x^2)) dx
Doubly triangular number
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review Differentiation [Implicit]
【Azur Files/MMD】Mika Seizono - Rabbit Hole【4K - 60fps】
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2 ways of "counting": 1=1/2+1/4+1/8+1/16+ ...
BEBEFINN,🥰❤️
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Demon Slayer: The Movie (2016)
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"My laughter is killing me. This version of Bye Bye Bye is outrageous!"
2.5 ways: trig derivative x sin(x) cos(x)
Others cosplay as ghosts, I cosplay as a staff member