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• Identical expressions

• -(x*cos(x) + three *sin(x)) = zero
• minus (x multiply by co sinus of e of (x) plus 3 multiply by sinus of (x)) equally 0
• minus (x multiply by co sinus of e of (x) plus three multiply by sinus of (x)) equally zero
• -(xcos(x) + 3sin(x)) = 0
• -xcosx + 3sinx = 0

• Similar expressions

• -(x*cos(x) - 3*sin(x)) = 0
• (x*cos(x) + 3*sin(x)) = 0
• -(x*cosx + 3*sinx) = 0