Simplify the expression $\sin 4x+\sin 8x+\cdots+\sin 4nx$
5080
How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?
65093
Integrate $\int \sin^4x \cos^2x dx$
131688
Solve $\sin 7x+\sin 3x=0$
148207
Express $\cos 6\theta $ in terms of $\cos \theta$
46665
Solving $\cos x+\sin x-1=0$
48200
Simplify $\sum_{i=0}^n (i+1)\binom ni$
71766
simplify boolean expression: xy + xy'z + x'yz'
112036
sum of series $\frac{n}{1\cdot 2 \cdot 3}+\frac{n-1}{2\cdot 3\cdot 4}+\frac{n-2}{3\cdot 4 \cdot 5}+\cdots \cdots n$ terms
10222
Simplify $\sum (x_i- \mu)^2$
99843
How to simplify $ \sum_{k=0}^{\infty} \binom{k + r - 1}{k} x^k$
115213
How to simplify $\sqrt[3]{7+5\sqrt{2}}+\sqrt[3]{7-5\sqrt{2}}$
75487
How to express trigonometric equation in terms of of given trigonometric function?
68725
Find expression for : $ S_n =\sum_{i=1}^{n} \frac{i}{i^4+i^2+1} $
131897
Please check my simplification for x?
116722
Simplifying $\big(\sum_{i=0}^n\binom{k}{i}\binom{M-k}{n-i}\frac{k-i}{M-n}\big)/{\binom{M}{n}}$
22505
Evaluate : $1+\frac{2}{6}+\frac{2\cdot 5}{6\cdot 12}+\frac{2\cdot 5\cdot 8}{6\cdot12\cdot 18}+\ldots$
140342
$\frac {1}{5}-\frac{1.4}{5.10}+\frac{1.4.7}{5.10.15}-\cdot\cdot\cdot\cdot\cdot\cdot\cdot$