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Apr
21
answered Find $[3T^{n+2} + 3T^{n+1} + 3T^{n}]_{B}$ where $T(a,b,c) = (b,c,a)$
Apr
19
answered Prove $\sum _{k=2}^{n} k(k-1) {n \choose k}=n(n-1)2^{n-2}$
Jan
6
answered Find the range of $k$ for which the inequality $k\cos^2x-k\cos x+1\geq0 ,\forall x\in(-\infty,\infty)$ holds.
Jan
1
answered The value of the polynomial at given point.
Oct
7
answered Permutation in which the $A's$ appear together in a block of $4$ letters or the $B's$ appear together in a block of $3$ letters
Aug
7
answered Prove identity: $\frac{1+\sin\alpha-\cos\alpha}{1+\sin\alpha+\cos\alpha}=\tan\frac{\alpha}{2}$
May
29
answered Find an acute angle $\gamma$ such that $\sin \gamma + \cos \gamma= \sqrt{2}$
May
24
answered How to convert $\cos4\theta$ into $\cos3\theta$
Oct
22
answered Without actually calculating the value of cubes find the value of $(1)^3+(2)^3+2(4)^3+(-5)^3+(-6)^3$. Also write the identity used
Sep
20
answered How do I factor $z^4+2z^3+4z^2+2z+3$?
Aug
31
answered Finding the value of $\frac{\cos^4\beta}{\cos^2\alpha} + \frac{\sin^4\beta}{\sin^2\alpha}$.
Aug
30
answered Adding $2$ absolute values together: $|x+2| + |x-3| =5.$
Jun
24
answered Problem of quadratic equation
May
20
answered Inequality involving conjugate numerator/denominator pairs
May
17
answered Absolutet Value Inequality with cases number line
May
17
answered what is the solution for this equation : $2^x-6(2)^{-x}=6$
May
17
answered Graph this function: F(x)=$-2^{|x|+1}$.
Apr
22
answered How to solve this inequality?
Apr
13
answered Problem : Solve $|x^2+x-4| =|x^2-4| +|x|$
Mar
19
asked Prove that $\rm area(\triangle ABE) = area (ABCD)$