Question

# without using trigonometric tables prove that:
cos²72° + cos²18° = 1
please give me the correct answer:)​

Answer 1

Answer:

Step-by-step explanation:cos²72 = cos²(90 - 18) = sin²18 = (√5 - 1)/4

sin²54 = sin²(90 - 36) = cos²36 = (√5 + 1)/4

now, cos²72 - sin²54

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Answer 2

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Step-by-step explanation:

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