Question

If tan 5A.tan4A =1 ;
find the value of A​

Answer 1

Answer:

A = 10degree

Step-by-step explanation:

tan cot =1

tan4A = cot5A

tan4A = tan(90-5A)

4A = 90-5A

90 = 4A+5A

90 = 9A

A = 10 degree