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Question : 24 of 160
Marks:
+1,
-0
Solution:
Consider the expression,
r4+r2+2=(r2−r+1)(r2+r+1)So,
tan−1() =tan−1(r2+r+1)−tan−1(r2−r+1) Solve further,
tan−1()=tan−1(r2+r+1)−tan−1(r2−r+1)=−tan−1(n2+n+1)−tan−1(1)=tan−1=tan−1So,
‌tan−1()=tan−1()=
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