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नीचे किसी प्रत्यास्थ तरंग (अनुप्रस्थ अथ...

नीचे किसी प्रत्यास्थ तरंग (अनुप्रस्थ अथवा अनुदैर्ध्य ) के विस्थापन को निरूपित करने वाले x तथा t के फलन दिए गए हैं । यह बताइए की इनमे से कौन (i) प्रगामी तरंग को, (ii) अप्रगामी तरंग को, (iii) इनमे से किसी भी तरंग को नहीं निरूपित करता हैं
(a) `y=2cos(3x)sin10t`
(b) `y=2sqrt(x-vt)`
(c) `y=3sin(5x-0.5t)+4cos(5x-0.5t)`
(d) `y=cosxsint+cos2xsin2t`

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