How can you use the Law of Cosines to show that "u ∙ v = ║u║║v║cosθ "
58958
How to understand dot product is the angle's cosine?
33396
Generalizing a Trig Identity
150321
How do you prove Cov $\left( \bar{X} , X_i - \bar{X} \right) = 0$?
125680
Show that $(1+u) \log (1+u) - u \ge \frac{u^2}{2(1+u/3)} $
108837
How to show that $\vdash (\forall x \beta \to \alpha) \leftrightarrow \exists x (\beta \to \alpha)$?
34702
Show $|A + uv^T| = (1 + v^T A^{-1} u) |A|$
99221
Orthogonality lemma sine and cosine
41191
How to prove this $\pi$ formula?
9003
prove $\frac{1}{2}\mathbf{\nabla (u \cdot u) = u \times (\nabla \times u ) + (u \cdot \nabla)u}$ using index notation
35564
Prove that $u\cdot v = \frac{1}{4}||u+v||^2 - \frac{1}{4}||u-v||^2 \forall u,v \in \mathbb{R^n}$
24128
How do i show that $w=z^2$ maps $|z-1|\leq 1$ onto $R=2(1+\cos \theta)$?
8711
Problems in the relation $a=v\frac{\mathrm{d}v}{\mathrm{d}x}$
127976
What does upside down "v" ($\wedge$) mean in this equation?
151038
How to prove (A v B), (A → C), (B → D) therefore (C v D)
13899
Proof that $-v = (-1)*v$
95379
Prove that $V = V_1 \oplus V_2$ in the following
83449
Proof with 3D vectors