Which of these is equal to cos 47Á? A) cos 43Á B) sin 43Á C) tan 43Á D) cos 133Á

asked Sep 15, 2017 126k views

1 vote

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4 votes

I believe the answer is B.

LeoE answered Sep 16, 2017

by LeoE

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6 votes

Correct answer is B.

$\alpha+\beta=90^o \\ cos(\alpha)=sin((90^o-\alpha)) \\ cos(47^o)=sin((90^o-47^o))=sin(43^o)$

Bleyk answered Sep 20, 2017

by Bleyk

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