Question

find the value of : 2tan25°. tan65°

Answer 1

As tan 65 = tan (90-25) = cot 25

So 2 tan 25 tan 65

= 2 tan 25 cot 25

As cot 25 = 1/tan 25

So 2 tan 25 × 1/tan 25

2× 1

2

Answer 2

Answer:

Step-by-step explanation:

tan 65 = tan (90-25) = cot 25

So 2 tan 25 tan 65

= 2 tan 25 cot 25

As cot 25 = 1/tan 25

So 2 tan 25 × 1/tan 25

2× 1

2