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• Identical expressions

• cos(x - one)/sin(x - one) = zero
• co sinus of e of (x minus 1) divide by sinus of (x minus 1) equally 0
• co sinus of e of (x minus one) divide by sinus of (x minus one) equally zero
• cosx - 1/sinx - 1 = 0
• cos(x - 1) divide by sin(x - 1) = 0

• Similar expressions

• cos(x + 1)/sin(x - 1) = 0
• cos(x - 1)/sin(x + 1) = 0