Question

find the value of tan 2 A,if cos 3A=sin 45

Answer 1

Answer:

Step-by-step explanation:

sin[90-3A]=sin 45

90-3A=45

90-45=3A

3A=45

A=15

tan 2A=tan2{15}=tan30=1/root3

Answer 2

Answer:

Step-by-step explanation:

cos 3A = sin 45° = cos 45° , then if 3A is än acute angle then 3A = 45°, then A = 15°, then 2A = 30°, then

tan 2A = tan 30° = 1/sqrt(3).