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• three *cos(x/ two)/ four = zero
• 3 multiply by co sinus of e of (x divide by 2) divide by 4 equally 0
• three multiply by co sinus of e of (x divide by two) divide by four equally zero
• 3cos(x/2)/4 = 0
• 3cosx/2/4 = 0
• 3*cos(x divide by 2) divide by 4 = 0