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• Derivative Step by Step
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• Identical expressions

• -(sin(x) + cos(x)) = zero
• minus ( sinus of (x) plus co sinus of e of (x)) equally 0
• minus ( sinus of (x) plus co sinus of e of (x)) equally zero
• -sinx + cosx = 0

• Similar expressions

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