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1-cos^2 (x) = sin^2 (x)
is this correct?
1 answer
Yes, but you must also understand why this is the case.
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expres the following as sums and differences of sines or cosines
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yes
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Let cos 67.5° = [√(2(+√2)]/2, find tan 67.5°. Show work and simplify.
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