buktikan bahwa sec²x - tan²x = 1 !
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❐ Trigonometri
[tex] \rm \to Terbukti [/tex]
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[tex] \rm sec²x - tan²x = 1 [/tex]
[tex] \rm \dfrac {1}{cos²x} - \dfrac {sin²x}{cos²x} = 1 [/tex]
[tex] \rm \dfrac {1-sin²x}{cos²x} = 1 [/tex]
[tex] \rm \dfrac {cos²x}{cos²x} = 1 [/tex]
[tex] \rm 1 = 1 [/tex]
Sifat trigonometri
[tex] \rm sin²x+cos²x = 1 \iff 1-sin²x = cos²x [/tex]
