Question

i) 1-cos20 /1+cos 20= tan²0​

Answer 1

Answer:

Step-by-step explanation:

(1-cos2Ф)/(1+cos2Ф) = 2sin²Ф/2cos²Ф         ∵[1-cos2Ф=2sin²Ф

                                 = tan²Ф                              1+cos2Ф = 2cos²Ф]