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• Identical expressions

• -y*sin(y) + cos(y) = zero
• minus y multiply by sinus of (y) plus co sinus of e of (y) equally 0
• minus y multiply by sinus of (y) plus co sinus of e of (y) equally zero
• -ysin(y) + cos(y) = 0
• -ysiny + cosy = 0

• Similar expressions

• y*sin(y) + cos(y) = 0
• -y*sin(y) - cos(y) = 0