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Beberapa rumus identitas trigonometri,cos^2x + sin^2x = 1
cos2x = cos^2x - sin^2x
sin2x = 2 sinx cosx
tan2x = (tanx + tanx) / 1 - tan^2x
Contoh soal :
Tentukan nilai dari :
a) cos (180°-60°)
b) sin (120°-30°)
Beberapa rumus lainnya dapat diturunkan dari rumus di atas.
Semoga membantu
Kelas X
Beberapa Sifat² Trigonometri
1.) Sudut Berelasi
sin(90° - α) = cos α
cos(90° - α) = sin α
cot(90° - α) = tan α
sin(180° + α) = -sin α
cos(180° + α) = -cos α
tan(180° + α) = tan α
sin(180° - α) = sin α
cos(180° - α) = -cos α
tan(180° - α) = -tan α
sin(360° - α) = -sin α
cos(360° - α) = cos α
tan(360° - α) = -tan α
sin(-α) = - sin α , cos (-α) = cos α, tan (-α) = -tan α
2.) Aturan Cosinus
a² = b² + c² - 2bc cos A
b² = a² + c² - 2ac cos B
c² = a² + b² - 2ab cos C
3.) Luas Segitiga
L = ½ bc sin A
L = ½ ac sin B
L = ½ ab sin C
4.) Rumus Jumlah dan Selisih 2 Sudut
sin(A ± B) = sin A cos B ± cos A sin B
Sisanya Ada di gambar , semoga membantu