Better rendering in newer browsers using MathML General equations for testing the browser Quadratic Formula x=−b±b2−4ac2a Cosine cos(θ+φ)=cos(θ)cos(φ)−sin(θ)sin(φ) Properties of Sunlight F( λ )= 2πh c 2 λ 5 ( exp( hc kλT )−1 ) I D =1.353× 0.7 ( A M 0.678 )