Question

Cos2 0 (1+ tan 20) = 1​

Answer 1

Answer:

1+tan 20=1/cos 20

1+tan 20=sec 20

sec 20-tan 20=1

by formula

sec^2 20-tan^2 20=1

(sec 20-tan20)(sec 20+tan 20)=1

sec 20+tan 20=1

Answer 2

Step-by-step explanation:

please give me brainlist answer please i need it