Question

question is in the above attachment​

Answer 1

Step-by-step explanation:

You cant type symbol theta so I take theta = a

It is equal to

[(sin²a/cos²a) - 1] × 1/cos²a

= [(sin²a - cos²a)/cos²a] × sec²a

= [(1 - 2cos²a)/cos²a] × sec²a

= (sec²a - 2) × sec²a

= sec⁴a - 2sec²a