Question

Sec5A=cos4A where 5A and 4A are acute angle. Find the value is A

Answer 1

Answer:

A=10

Step-by-step explanation:

Sec 5A=Cos 4A (given)

Sec 5A can be written as

Cos(90-5A)

so,

Cos (90-5A)=Cos 4A

Cos on both sides will be cancelled.Then,

90-5A=4A

90=4A+5A

90=9A

A=90÷9

A=10