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cos(67.5°)

Question

Find the exact value

cos(67.5°)
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cos(67.5°)

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Step 1

To evaluate cos (67.5 degrees) exactly (without calculator or tables)

Step 2

Observe that 2 times 67.5 degrees is 135 degrees , which is related to 45 degre...

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Math

Trigonometry

Trigonometric Ratios

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