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2nd/2 parts: Mean 1+2+3+...+n is just (1+n)/2. Why?
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Solve the following differential equation cos^2(x)dy/dx +y = tan(x)
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logic Idempotent law show x=xVx
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trig Write each expression as an equivalent algebraic expression involving only x.
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Alternate way: Find 1+2+3+... +(n-1)+n via "polynomial degree 2"
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STPM Math T Sem.2: 12.1 Numerical solution of Equations
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STPM Math T Sem. 2: Ex 11.2 Given that f(x)=tan(x), show that ...
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3 picture views of the sum ... 1+2+3+...+n
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Solve cos^2(x) dy/dx +y = tan(x) via Integrating factor[IF]
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Prove the slope-intercept formula by using the slope formula for the line that has slope m, ...
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4 ways: Evaluate Σ(2k+1) k=1,20
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trig integral ∫sec^2(x)/tan(x) dx vs ∫tan(x)/sec^2(x) dx
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