# Irrational

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bio website location Serbia age member for 2 years, 5 months seen Aug 17 at 20:40 profile views 47

# 27 Questions

 4 Proof of trigonometric identity $\frac{\cos x+i\sin x+1}{\cos x+i\sin x-1}= -\frac{i}{\tan \frac{x}{2}}$ 3 Making a $m*n$ chocolate bar out of $1*k$ chocolate bars 3 Number of ways to place $k$ non-attacking rooks on an $m\times n$ chessboard 3 Solve trigonometric equation $\sin14x - \sin12x + 8\sin x - \cos13x= 4$ 3 Logarithm base transformation

# 140 Reputation

 +5 Making a $m*n$ chocolate bar out of $1*k$ chocolate bars -2 Find the last two digits of 9^(9^9) +3 Calculate $\frac{2\cos40^\circ-\cos20^\circ}{\sin20^\circ}$ +5 Solve for x if $z$ is a complex number such that $z^2+z+1=0$

 1 How to extend a line when its slope is defined 0 solving 3-d coordinates from x, y and z distance 0 Prove $(A \cup B) \cap C$ = $(A \cap C) \cup (B \cap C)$

# 25 Tags

 1 geometry × 5 0 algebra-precalculus × 3 1 algebraic-geometry 0 calculus × 2 0 trigonometry × 4 0 complex-numbers × 2 0 combinatorics × 4 0 logarithms × 2 0 divisibility × 3 0 polar-coordinates

# 6 Accounts

 Mathematics 140 rep 9 Stack Overflow 67 rep 110 Physics 41 rep 4 Graphic Design 12 rep 2 Chemistry 11 rep 1