© examsiri.com
Question : 107 of 160
Marks:
+1,
-0
Solution:
‌‌ Given, ‌ sinh−12+ sinh−13=x‌⇒‌‌cosh( sinh−12+ sinh−13)=cosh‌x‌⇒‌‌cosh( sinh−12)‌cosh( sinh−13)‌+ sinh( sinh−12) sinh( sinh−13)‌=cosh‌x‌⇒cosh‌x=cosh(cosh−1√1+22)×‌cosh(cosh−1√1+32)+2×3‌⇒cosh‌x=(√5√10+6)×‌‌=‌(12+2√50)‌
© examsiri.com
Go to Question: