SOLUTION: If cos β = -3/5 then, without a calculator, find cos( π/2 - β) and express your answer as a fraction.
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Question 1165340: If cos β = -3/5 then, without a calculator, find cos( π/2 - β) and express your answer as a fraction.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
\ =\ \sin\varphi)
.
See the formula for the cosine of the difference between two angles.
John
My calculator said it, I believe it, that settles it
I > Ø
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