What is \(\frac{1-\cos 2x}{\sin 2x}\) equal to?
Answer and explanation
Correct answer: \(\tan x\)
Use the identities \(1-\cos 2x=2\sin^2x\) and \(\sin 2x=2\sin x\cos x\). Therefore, \(\frac{1-\cos 2x}{\sin 2x}=\frac{2\sin^2x}{2\sin x\cos x}=\frac{\sin x}{\cos x}=\tan x\). \(\cot x\) is the reciprocal of \(\tan x\), so it is not correct. Exam tip: first rewrite both numerator and denominator using double-angle identities.
Frequently asked questions
What is the correct answer to this question?
\(\tan x\)
Why is this the correct answer?
Use the identities \(1-\cos 2x=2\sin^2x\) and \(\sin 2x=2\sin x\cos x\). Therefore, \(\frac{1-\cos 2x}{\sin 2x}=\frac{2\sin^2x}{2\sin x\cos x}=\frac{\sin x}{\cos x}=\tan x\). \(\cot x\) is the reciprocal of \(\tan x\), so it is not correct. Exam tip: first rewrite both numerator and denominator using double-angle identities.
Which subject and chapter does this question cover?
This is a Class 12 Mathematics question. Chapter: Trigonometric Functions. Topic: Trigonometric functions and their properties.
