10.4: Mathematical Formulas - Trigonometry Last updated Jul 7, 2024 Save as PDF 10.3: Conductivity of Some Common Materials 10.5: Mathematical Formulas - Vector Operators Page ID97193 Steven W. EllingsonVirginia Polytechnic Institute and State University via Virginia Tech Libraries' Open Education Initiative ( \newcommand{\kernel}{\mathrm{null}\,}\) ejθ=cosθ+jsinθ cosθ=12(ejθ+e−jθ) sinθ=1j2(ejθ−e−jθ) cos2θ=12+12cos2θ sin2θ=12−12cos2θ