ISRO Electronics & Communication (ECE) 2007 - Question 9

All ISRO Electronics & Communication (ECE) papers | ISRO Electronics & Communication (ECE) 2007

$\cos \theta$ can be represented by

  • A. $\frac{e^{+j\theta}-e^{-j\theta}}{2}$
  • B. $\frac{e^{j\theta}-e^{-j\theta}}{2j}$
  • C. $\frac{e^{j\theta}+e^{-j\theta}}{2}$
  • D. $\frac{e^{j\theta}+e^{-j\theta}}{2j}$

Answer: C. $\frac{e^{j\theta}+e^{-j\theta}}{2}$

| | All questions of ISRO Electronics & Communication (ECE) 2007