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itu rumus identitas trigonometri
1 + tan² x = sec² x
pembuktian:
1 + sin²x/cos²x = sec²x
(cos²x + sin²x)/cos²x = sec²x
1/cos²x = sec²x
sec²x = sec²x
(terbukti)
x²/x² + y²/x² = r²/x²
1 + (y/x)² = (r/x)²
1 + tan² = sec² . terbukti
Nb.... y/x = tan
r/x = sec