Recall that

Dividing both sides by cosh²(x) gives

Also, recall the identity

Then

Answer:
is this a question meant to evaluate you, such as a test, exam, quiz, or assessment?
Step-by-step explanation:
x+x squared =42. The square of the number is the number square. By my incredibly accurate guess and check strategy (works most of the time )6*6 = 36+6=42
Answer:
142.5
Step-by-step explanation:
π×11²×135/360
= 363π/8
= 142.5 (rounded to the nearest tenth)
Answered by GAUTHMATH