Math, asked by san1029, 8 months ago

what is cos²72⁰+cos²18⁰

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Answered by vijayapravallikapatt

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Answered by SrikarGurram

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Answer:

answer=1

Step-by-step explanation:

cos²72°=cos(90-18)°

=sin²18°

sin²18°+cos²18

sin²ø+cos²ø=1

sin²18°+cos²18°=1

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