Prove that 2cos^2theta (1+tan^2theta)=2
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Answer:
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Step-by-step explanation:
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Answered by
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Step-by-step explanation:
2cos²©(1+tan²©)
2cos²©(1+sin²©÷cos²©)
2cos²©(sin²©+cos²©)/cos²©
2cos²©/cos²©
2
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