Porsha W.
asked • 04/11/20need help with this establish identity
cos5A−cosA/sin5a−sinA =
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1 Expert Answer
Yefim S. answered • 04/11/20
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We use formulas from sum (difference to product): (cos5A - cosA)/(sin5A - sinA) = - 2·sin(5A + A)/2sin(5A - A)/2/2sin(5A - A)/2·cos(5A + A)/2 = - 2sin3A·sin2A/2sin2A·cos3A = - sin3A/cos3A = - tan3A.
Answer: this expression equel: - tan(3A)
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Mark M.
You do not present an identity.04/11/20