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[cos y cos((pi)/(2)-x)-cos((pi)/(2)-y)co...

[cos y cos((pi)/(2)-x)-cos((pi)/(2)-y)cos x],[+sin y cos((pi)/(2)-x)+cos x sin((pi)/(2)-y)=11],[sin2x-4sit4]

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The value of cos y cos ((pi)/(2) - x) - cos ((pi)/(2) - y) cos x + sin y cos ((pi)/(2) - x) + cos x sin ((pi)/(2) - y) is zero if

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