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• Identical expressions

• - two *sin(two *x)/cos(two *x) = zero
• minus 2 multiply by sinus of (2 multiply by x) divide by co sinus of e of (2 multiply by x) equally 0
• minus two multiply by sinus of (two multiply by x) divide by co sinus of e of (two multiply by x) equally zero
• -2sin(2x)/cos(2x) = 0
• -2sin2x/cos2x = 0
• -2*sin(2*x) divide by cos(2*x) = 0

• Similar expressions

• 2*sin(2*x)/cos(2*x) = 0