Two sinusoidal waves have the same angular frequency, the same amplitude \( y_{m} \), and travel...

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Two sinusoidal waves have the same angular frequency, the same amplitude \( y_{m} \), and travel in the same direction in the same medium. If they differ in phase by \( 50^{\circ} \), the amplitude of the resultant wave is given by
(A) \( 0.64 y_{m} \)
(B) \( 1.3 y_{m} \)
(C) \( 0.91 y_{m} \)
(D) \( 1.8 y_{m} \)
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