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If e1=E1sin(omega1t-k1x+phi1) and e2=E2s...

If `e_1=E_1sin(omega_1t-k_1x+phi_1)` and `e_2=E_2sin(omega_2t-k_2x+phi_2)` and `e=e_1+e_2` then show that `E^2=E_1^2+E_2^2+2E_1E_2cos(delta_2-delta_1)` where `delta_1=omega_1t-k_1x+phi_1` and `delta_2=omega_2t-k_2x+phi_2`

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