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• Identical expressions

• -(y*cos(y) - two *sin(y)) = zero
• minus (y multiply by co sinus of e of (y) minus 2 multiply by sinus of (y)) equally 0
• minus (y multiply by co sinus of e of (y) minus two multiply by sinus of (y)) equally zero
• -(ycos(y) - 2sin(y)) = 0
• -ycosy - 2siny = 0

• Similar expressions

• -(y*cos(y) + 2*sin(y)) = 0
• (y*cos(y) - 2*sin(y)) = 0