SOLUTION: prove or disprove without a calculator. 1. sin(pi/2 + theta) = cos theta

SOLUTION: prove or disprove without a calculator. 1. sin(pi/2 + theta) = cos theta

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Question 139726: prove or disprove without a calculator.
1. sin(pi/2 + theta) = cos theta

Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Can't render theta on this site, so I'll use something else

So
, but and , so

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