Question

(1-cosB) (1+ cosB)
(1-sinB) (1+sin B) = 1/3 jab b =30​

Answer 1

Step-by-step explanation:

(1-cosB)(1+cosB)/(1-sinB)(1+sinB)

=(1-cos²B)/(1-sin²B)

=1-cos²30/1-sin²30

=1-(3/4)/1-(1/4)

=(1/4)/(3/4)

=1/3