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jika kedua ruas dibagi sin²a ⇒1 + cos²a/sin²a = 1/sin²a ⇒(q) 1 + cot²a = csc²a
jika kedua ruas dibagi cos²a ⇒sin²a/cos²a + 1 = 1/cos²a ⇒(r)tan²a + 1 = sec²a
Sehingga dengan menggunakan (r)
maka cos²a + tan²a - sec²a = cos²a + (sec²a - 1) - sec²a =
cos²a + (sec²a - sec²a) - 1 =
cos²a + 0 - 1 =
cos²a - 1 =
gunakan (p)
cos²a - 1 = sin²a
:. sin²a