cos^4alpha+2cos^2alpha×1-1/sec^2alpha
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Answer:
cos²α(cos²α+1)
Step-by-step explanation:
cos⁴α+2cos²α×1– 1/sec²α
=> cos⁴α+2cos²α–cos²α [1/sec²α=cos²α]
=> cos⁴α+cos²α
=> cos²α (cos²α+1)
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