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Can someone explain to me how to solve this? Find a cofunction with the same value as the given expression. 18) cos 57° 19) tan 27° 20) csc 42°

Mathematics
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\[\cos u =\sin[ (\frac{ \pi }{ 2 })-u]\]
:( im sorry im still confused
cos u represents cos 57 question 18. It is equal to the cofunction on the right hand side

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im sorry i still dont get it

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