Question

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

Answer 1

I believe the answer is B.

Answer 2

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)`