Question

Sum of $50$ terms of $\cot^{-1}3+\cot^{-1}7+\cot^{-1}13+\cot^{-1}21+.....$

score 1.4k · Answer 1 · 2026-03-26 13:02:15

1.4k

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Sum of $50$ terms of $\cot^{-1}3+\cot^{-1}7+\cot^{-1}13+\cot^{-1}21+.....$

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112

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score 169 · Answer 11 · 2026-04-14 21:30:48

169

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Find all solutions X for the equation: $\sin(x)-\cos(x) = 2\sqrt2\sin(x)\cos(x)$

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score 104 · Answer 12 · 2026-04-13 12:10:30

104

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208

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63

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score 151 · Answer 15 · 2026-04-12 03:43:40

151

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Spherical cap problem - trigonometry / circle theorems problem / surface area

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List Question

Sum of $50$ terms of $\cot^{-1}3+\cot^{-1}7+\cot^{-1}13+\cot^{-1}21+.....$

IQ modulation, sum of I and Q sinewaves

How to find absolute mininum/maximum of a function on a set?

Find a wave function with the given zeros

Finding the adjacent of a right angle triangle with given height.

Finding roots of $m\cos a x + q \cos b x=0$ when $m\neq q$

Bounded function in $[0,1]$ without max and min.

Rotate isometric projection to square projection

Greater of the angles $\alpha=2\tan^{-1}(2\sqrt{2}-1)$, $\beta=3\sin^{-1}\frac{1}{3}+\sin^{-1}\frac{3}{5}$

Rewrite $\sec^2 (x) \cdot \sin^2 (x) $in terms of $\cos (x)$

Find all solutions X for the equation: $\sin(x)-\cos(x) = 2\sqrt2\sin(x)\cos(x)$

Can an equation of the form $\sin(\omega t) + at^2+bt=N$, with $a\neq 0$, be solved analytically?

Write down two values of $k$ for which the equation $f(x)=k$ has exactly two solutions.

Algorithm to find if a triangle (with given vertices) contains a point $P$

Spherical cap problem - trigonometry / circle theorems problem / surface area

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