admin Membahas dengan sederhana rumus-rumus yang ada di matematika dan finansial - Bagi Aja

Rumus Trigonometri|Identitas, Sudut Rangkap

8 sec read

Berikut ini adalah rangkuman rumus rumus trigonometri Rumus Identitas, Sudut Rangkap lengkap untuk catatan mengerjakan soal

Rumus Trigonometri

{\displaystyle \sin A={\frac {a}{c}}}

{\displaystyle \cos A={\frac {b}{c}}}

PHP Dev Cloud Hosting

{\displaystyle \tan A={\frac {\sin A}{\cos A}}={\frac {a}{b}}}

{\displaystyle \cot A={\frac {1}{\tan A}}={\frac {\cos A}{\sin A}}={\frac {b}{a}}}

{\displaystyle \sec A={\frac {1}{\cos A}}={\frac {c}{b}}}

{\displaystyle \csc A={\frac {1}{\sin A}}={\frac {c}{a}}}

Affiliate Banner Unlimited Hosting Indonesia

Identitas Trigonometri

{\displaystyle \sin ^{2}A+\cos ^{2}A=1}

{\displaystyle 1+\tan ^{2}A={\frac {1}{\cos ^{2}A}}=\sec ^{2}A}

{\displaystyle 1+\cot ^{2}A={\frac {1}{\sin ^{2}A}}=\csc ^{2}A}

Kesamaan nilai Trigonometri

{\displaystyle sinA=cos(90-A)\;atau\;\cos({\frac {\pi }{2}}-A)}

{\displaystyle \tan A=\cot(90-A)\;atau\;\cot({\frac {\pi }{2}}-A)}

{\displaystyle \sec A=\csc(90-A)\;atau\;\csc({\frac {\pi }{2}}-A)}

Jumlah dan selisih sudut

{\displaystyle \sin(A+B)=\sin A\cos B+\cos A\sin B}

{\displaystyle \sin(A-B)=\sin A\cos B-\cos A\sin B}

{\displaystyle \cos(A+B)=\cos A\cos B-\sin A\sin B}

{\displaystyle \cos(A-B)=\cos A\cos B+\sin A\sin B}

{\displaystyle \tan(A+B)={\frac {\tan A+\tan B}{1-\tan A\tan B}}}

{\displaystyle \tan(A-B)={\frac {\tan A-\tan B}{1+\tan A\tan B}}}

Perkalian trigonometri

{\displaystyle 2\sin A\cos B=\sin(A+B)+\sin(A-B)}

{\displaystyle 2\cos A\sin B=\sin(A+B)-\sin(A-B)}

{\displaystyle 2\cos A\cos B=\cos(A+B)+\cos(A-B)}

{\displaystyle 2\sin A\sin B=-\cos(A+B)+\cos(A-B)}

Jumlah dan Selisih trigonometri

{\displaystyle \sin A+\sin B=2\sin {\biggl (}{\frac {A+B}{2}}{\biggl )}\cdot \cos {\biggl (}{\frac {A-B}{2}}{\biggl )}}

{\displaystyle \sin A-\sin B=2\cos {\biggl (}{\frac {A+B}{2}}{\biggl )}\sin {\biggl (}{\frac {A-B}{2}}{\biggl )}}

{\displaystyle \cos A+\cos B=2\cos {\biggl (}{\frac {A+B}{2}}{\biggl )}\cos {\biggl (}{\frac {A-B}{2}}{\biggl )}}

{\displaystyle \cos A-\cos B=-2\sin {\biggl (}{\frac {A+B}{2}}{\biggl )}\sin {\biggl (}{\frac {A-B}{2}}{\biggl )}}

{\displaystyle \tan A+\tan B=\tan(A+B)\cdot (1-\tan A\tan B)}

{\displaystyle \tan A-\tan B=\tan(A-B)\cdot (1+\tan A\tan B)}

{\displaystyle \sin A+\sin B+\sin C=4\sin {\frac {A}{2}}\cdot \sin {\frac {B}{2}}\cdot \sin {\frac {C}{2}}}

{\displaystyle \cos A+\cos B+\cos C=1+4\sin {\frac {A}{2}}\cdot \sin {\frac {B}{2}}\cdot \sin {\frac {C}{2}}}

{\displaystyle \tan A+\tan B+\tan C=\tan A\cdot \tan B\cdot \tan C}

Sudut rangkap dua

{\displaystyle \sin 2A=2\sin A\cdot \cos A}

{\displaystyle \cos 2A=\cos ^{2}A-\sin ^{2}A=1-2\sin ^{2}A=2\cos ^{2}A-1}

{\displaystyle \tan 2A={\frac {2\tan A}{1-\tan ^{2}A}}={\frac {2\cot A}{\cot ^{2}A-1}}={\frac {2}{\cot A-\tan A}}}

Cloud Hosting

Sudut rangkap tiga

{\displaystyle \sin 3A=3\sin A-4\sin ^{3}A}

{\displaystyle \cos 3A=4\cos ^{3}A-3\cos A}

{\displaystyle \tan 3A={\frac {3\tan A-\tan ^{3}A}{1-3\tan ^{2}A}}}

Setengah sudut

{\displaystyle \sin {\frac {A}{2}}=\pm {\sqrt {\frac {1-\cos A}{2}}}}

{\displaystyle \cos {\frac {A}{2}}=\pm {\sqrt {\frac {1+\cos A}{2}}}}

{\displaystyle \tan {\frac {A}{2}}=\pm {\sqrt {\frac {1-\cos A}{1+\cos A}}}={\frac {\sin A}{1+\cos A}}={\frac {1-\cos A}{\sin A}}}

admin Membahas dengan sederhana rumus-rumus yang ada di matematika dan finansial - Bagi Aja

Leave a Reply

Your email address will not be published. Required fields are marked *