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melisa1 [442]
3 years ago
14

The expression cos 42° in terms of sine

Mathematics
1 answer:
GalinKa [24]3 years ago
8 0

Answer:

\because \:  \cos \theta =  \sin \: (90 \degree -  \theta) \\  \\  \therefore \:  \cos \: 42 \degree =  \sin \: (90 \degree -  42 \degree) \\  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  = \sin \: 48 \degree \\  \\  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \orange{ \boxed{ \therefore \:  \cos \: 42 \degree =\sin \: 48 \degree}}

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