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פּוֹפּוּלָרִי טריגונומטריה >

prove cot(x)sec(x)csc^2(x)-cot^3(x)sec(x)=csc(x)

פתרון

prove

cot (x) sec (x) csc^{2} (x) - cot^{3} (x) sec (x) = csc (x)

פתרון

נכון

צעדי פתרון

cot (x) sec (x) csc^{2} (x) - cot^{3} (x) sec (x) = csc (x)

עבוד על אגף שמאל

cot (x) sec (x) csc^{2} (x) - cot^{3} (x) sec (x)

sin, cos :

בטא באמצאות

- cot^{3} (x) sec (x) + cot (x) csc^{2} (x) sec (x)

cot (x) = \frac{cos ( x )}{sin ( x )}

:Use the basic trigonometric identity

= - (\frac{cos ( x )}{sin ( x )})^{3} sec (x) + \frac{cos ( x )}{sin ( x )} csc^{2} (x) sec (x)

sec (x) = \frac{1}{cos ( x )}

:Use the basic trigonometric identity

= - (\frac{cos ( x )}{sin ( x )})^{3} \frac{1}{cos ( x )} + \frac{cos ( x )}{sin ( x )} csc^{2} (x) \frac{1}{cos ( x )}

csc (x) = \frac{1}{sin ( x )}

:Use the basic trigonometric identity

= - (\frac{cos ( x )}{sin ( x )})^{3} \frac{1}{cos ( x )} + \frac{cos ( x )}{sin ( x )} (\frac{1}{sin ( x )})^{2} \frac{1}{cos ( x )}

- (\frac{cos ( x )}{sin ( x )})^{3} \frac{1}{cos ( x )} + \frac{cos ( x )}{sin ( x )} (\frac{1}{sin ( x )})^{2} \frac{1}{cos ( x )}

פשט את:

\frac{- cos ^{2} ( x ) + 1}{sin ^{3} ( x )}

- (\frac{cos ( x )}{sin ( x )})^{3} \frac{1}{cos ( x )} + \frac{cos ( x )}{sin ( x )} (\frac{1}{sin ( x )})^{2} \frac{1}{cos ( x )}

(\frac{cos ( x )}{sin ( x )})^{3} \frac{1}{cos ( x )} = \frac{cos ^{2} ( x )}{sin ^{3} ( x )}

(\frac{cos ( x )}{sin ( x )})^{3} \frac{1}{cos ( x )}

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

:הכפל שברים

= \frac{1 \cdot ( \frac{c o s ( x )}{s i n ( x )} ) ^{3}}{cos ( x )}

1 \cdot (\frac{cos ( x )}{sin ( x )})^{3} = (\frac{cos ( x )}{sin ( x )})^{3} :

הכפל

= \frac{( \frac{c o s ( x )}{s i n ( x )} ) ^{3}}{cos ( x )}

(\frac{cos ( x )}{sin ( x )})^{3} = \frac{cos ^{3} ( x )}{sin ^{3} ( x )}

(\frac{cos ( x )}{sin ( x )})^{3}

(\frac{a}{b})^{c} = \frac{a ^{c}}{b ^{c}}

:הפעל את חוק החזקות

= \frac{cos ^{3} ( x )}{sin ^{3} ( x )}

= \frac{\frac{c o s ^{3} ( x )}{s i n ^{3} ( x )}}{cos ( x )}

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

: השתמש בתכונת השברים הבאה

= \frac{cos ^{3} ( x )}{sin ^{3} ( x ) cos ( x )}

cos (x) :

בטל את הגורמים המשותפים

= \frac{cos ^{2} ( x )}{sin ^{3} ( x )}

\frac{cos ( x )}{sin ( x )} (\frac{1}{sin ( x )})^{2} \frac{1}{cos ( x )} = \frac{1}{sin ^{3} ( x )}

\frac{cos ( x )}{sin ( x )} (\frac{1}{sin ( x )})^{2} \frac{1}{cos ( x )}

a \cdot \frac{b}{c} \cdot \frac{d}{e} = \frac{a \cdot b \cdot d}{c \cdot e}

:הכפל שברים

= \frac{cos ( x ) \cdot 1 \cdot ( \frac{1}{s i n ( x )} ) ^{2}}{sin ( x ) cos ( x )}

cos (x) :

בטל את הגורמים המשותפים

= \frac{1 \cdot ( \frac{1}{s i n ( x )} ) ^{2}}{sin ( x )}

1 \cdot (\frac{1}{sin ( x )})^{2} = (\frac{1}{sin ( x )})^{2} :

הכפל

= \frac{( \frac{1}{s i n ( x )} ) ^{2}}{sin ( x )}

(\frac{1}{sin ( x )})^{2} = \frac{1}{sin ^{2} ( x )}

(\frac{1}{sin ( x )})^{2}

(\frac{a}{b})^{c} = \frac{a ^{c}}{b ^{c}}

:הפעל את חוק החזקות

= \frac{1 ^{2}}{sin ^{2} ( x )}

1^{a} = 1

הפעל את החוק

1^{2} = 1

= \frac{1}{sin ^{2} ( x )}

= \frac{\frac{1}{s i n ^{2} ( x )}}{sin ( x )}

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

: השתמש בתכונת השברים הבאה

= \frac{1}{sin ^{2} ( x ) sin ( x )}

sin^{2} (x) sin (x) = sin^{3} (x)

sin^{2} (x) sin (x)

a^{b} \cdot a^{c} = a^{b + c}

:הפעל את חוק החזקות

sin^{2} (x) sin (x) = sin^{2 + 1} (x)

= sin^{2 + 1} (x)

2 + 1 = 3 :

חבר את המספרים

= sin^{3} (x)

= \frac{1}{sin ^{3} ( x )}

= - \frac{cos ^{2} ( x )}{sin ^{3} ( x )} + \frac{1}{sin ^{3} ( x )}

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

הפעל את החוק

= \frac{- cos ^{2} ( x ) + 1}{sin ^{3} ( x )}

= \frac{- cos ^{2} ( x ) + 1}{sin ^{3} ( x )}

= \frac{1 - cos ^{2} ( x )}{sin ^{3} ( x )}

Rewrite using trig identities

\frac{1 - cos ^{2} ( x )}{sin ^{3} ( x )}

1 = cos^{2} (x) + sin^{2} (x)

:הפעל זהות פיטגורית

1 - cos^{2} (x) = sin^{2} (x)

= \frac{sin ^{2} ( x )}{sin ^{3} ( x )}

\frac{sin ^{2} ( x )}{sin ^{3} ( x )}

פשט את:

\frac{1}{sin ( x )}

\frac{sin ^{2} ( x )}{sin ^{3} ( x )}

\frac{x ^{a}}{x ^{b}} = \frac{1}{x ^{b - a}}

:הפעל את חוק החזקות

\frac{sin ^{2} ( x )}{sin ^{3} ( x )} = \frac{1}{sin ^{3 - 2} ( x )}

= \frac{1}{sin ^{3 - 2} ( x )}

3 - 2 = 1 :

חסר את המספרים

= \frac{1}{sin ( x )}

= \frac{1}{sin ( x )}

= \frac{1}{sin ( x )}

Rewrite using trig identities

sin (x) = \frac{1}{csc ( x )}

:Use the basic trigonometric identity

\frac{1}{\frac{1}{c s c ( x )}}

פשט

\frac{1}{\frac{1}{c s c ( x )}}

\frac{1}{\frac{b}{c}} = \frac{c}{b}

: השתמש בתכונת השברים הבאה

= \frac{csc ( x )}{1}

\frac{a}{1} = a

הפעל את החוק

= csc (x)

csc (x)

csc (x)

הראנו ששני האגפים יכולים להיות מאותה הצורה

\Rightarrow נכון

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