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• Identical expressions

• -pi*sin(pi*x)*cos(cos(pi*x)) = zero
• minus Pi multiply by sinus of ( Pi multiply by x) multiply by co sinus of e of ( co sinus of e of ( Pi multiply by x)) equally 0
• minus Pi multiply by sinus of ( Pi multiply by x) multiply by co sinus of e of ( co sinus of e of ( Pi multiply by x)) equally zero
• -pisin(pix)cos(cos(pix)) = 0
• -pisinpixcoscospix = 0

• Similar expressions

• pi*sin(pi*x)*cos(cos(pi*x)) = 0