\(\frac{\cos(2\pi-x)}{\sin(\pi+x)}\) का सरल मान क्या है?
What is the simplified value of \(\frac{\cos(2\pi-x)}{\sin(\pi+x)}\)?
Explanation opens after your attempt
B. \(-\cot x\)
Simple Explanation
सर्वसमिकाओं \(\cos(2\pi-x)=\cos x\) तथा \(\sin(\pi+x)=-\sin x\) का प्रयोग करने पर \[\frac{\cos(2\pi-x)}{\sin(\pi+x)}=\frac{\cos x}{-\sin x}=-\cot x.\] अतः सही उत्तर \(-\cot x\) है। \(\cot x\) लेने पर हर के ऋण चिह्न की उपेक्षा हो जाएगी। परीक्षा टिप: \(\pi+x\) वाले कोण में sine का चिह्न ऋणात्मक होता है। / Using the identities \(\cos(2\pi-x)=\cos x\) and \(\sin(\pi+x)=-\sin x\), \[\frac{\cos(2\pi-x)}{\sin(\pi+x)}=\frac{\cos x}{-\sin x}=-\cot x.\] Therefore, the correct answer is \(-\cot x\). Choosing \(\cot x\) would ignore the negative sign in the denominator. Exam tip: for an angle of the form \(\pi+x\), sine has a negative sign.
Login to save your score, XP, coins and progress.
QR scan karne par isi question ka correct answer aur explanation khula hua milega.
Open answer link