Is 
?
The answer is no. Correct answer is 
See the following example how this concept is applied in H2 math
Example 1
Differentiate 
with respect to x
Therefore
Ans: -1 if sin x > 0, 1 if sin x < 0
Example 2
Category: Miscel
Factorial
Questions on factorial can appear in H2 math binomial expansion, partial fractions, method of difference, mathematical induction and probability. Knowing how to simplify and manipulate factorials are crucial to doing well.
Two commonly used techniques
1. Replace n! with n(n-1)!
2. Multiply by k/k or k! / k!
Example 1
H2 Maths Tuition 
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