The classic triad of Pulmonary Embolism (PE) — though present in only ~20% of cases — is:

1. Sudden dyspnea (most common presenting symptom)
2. Pleuritic chest pain (sharp, worsens on breathing)
3. Hemoptysis (blood-streaked sputum)

Other common signs of PE:

• Tachycardia
• Tachypnea (>20 breaths/min)
• Decreased SpO₂
• Anxiety and apprehension
• Signs of DVT (calf pain, swelling) in ~50% of cases

Nursing priority: High Fowler's position, oxygen therapy, IV access, notify physician immediately, prepare for anticoagulation therapy (heparin). PE is the most preventable cause of post-operative death.

Bilateral symmetry (also called axial or mirror symmetry) means one half of the composition is the mirror image of the other about a central axis.

Examples in architecture: Taj Mahal (bilateral symmetry on all four sides), most classical Greek temples, and many government buildings.

Other design principles: Rhythm = repetition of elements creating movement. Radial balance = elements arranged around a central point. Contrast = juxtaposition of opposing elements (light/dark, old/new).

$x = \displaystyle\int_1^2 v\,dt = \int_1^2 (At + Bt^2)\,dt = \left[\dfrac{At^2}{2} + \dfrac{Bt^3}{3}\right]_1^2$

$= \left(\dfrac{4A}{2} + \dfrac{8B}{3}\right) - \left(\dfrac{A}{2} + \dfrac{B}{3}\right) = \mathbf{\dfrac{3A}{2} + \dfrac{7B}{3}}$