The inverse operation of division is multiplication.
If 5 biscuits cost 40p
1 biscuit would cost (40p divided by 5) 8p
8p multiplied by 3 (to get 3 biscuits) would cost 24p
3 biscuits cost 24p
Recall that

Dividing both sides by cosh²(x) gives

Also, recall the identity

Then

Answer:
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Step-by-step explanation: