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cot²Ф + 2cotФ + 1=
csc²Ф + 2cotФ = csc²Ф + 2cotФ terbukti
3. secФ - cosФ = sinФ tanФ ane ubah ruas kiri
1 . cosФ = samakan penyebut
cosФ
1 - cos² Ф =
cosФ
sin²Ф =
cosФ
sinФ . sinФ=
cosФ
tanФ sinФ = tanФ sinФ terbukti