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rewona [7]
3 years ago
15

Why is sin 10= cos 80

Mathematics
1 answer:
Over [174]3 years ago
4 0
Hint:   \bf \textit{Cofunction Identities}
\\ \quad \\
sin\left(90^o-{{ \theta}}\right)=cos({{ \theta}})\qquad 
\boxed{cos\left(90^o-{{ \theta}}\right)=sin({{ \theta}})}
\\ \quad \\ \quad \\
tan\left(90^o-{{ \theta}}\right)=cot({{ \theta}})\qquad 
cot\left(90^o-{{ \theta}}\right)=tan({{ \theta}})
\\ \quad \\ \quad \\
sec\left(90^o-{{ \theta}}\right)=csc({{ \theta}})\qquad 
csc\left(90^o-{{ \theta}}\right)=sec({{ \theta}})
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