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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
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