d: \(sinB=cosC\)
\(sinB=cos\widehat{HAB}\)
\(sinC=cosB\)
\(sinC=cosHAC\)
\(sin\widehat{A_1}=cos\widehat{A_2}\)
\(tanB=cotC\)
\(tanB=cotHAB\)
\(tanC=cotB\)
\(\tan\widehat{A_1}=cot\widehat{A_2}\)
\(tanC=cotB=cotHAC\)
\(sin30=cos60\)
\(cos42=sin48\)
\(tan15=cot75\)
\(cot27^0=tan63^0\)
sin43=cos47
cos61=sin29
tan78=cot12
cot33=tan57
sin17=cos73
cos29=sin61
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