解決(frac{tan25^{circ}}{csc65^{circ}})^{2}+(frac{cot25^{circ}}{sec65^{circ}})^2+2tan18^circtan45^circtan72^circ |Microsoft數學求解器

$$( \frac { \tan 25 ^ { \circ } } { \csc 65 ^ { \circ } } ) ^ { 2 } + ( \frac { \cot 25 ^ { \circ } } { \sec 65 ^ { \circ } } ) ^ { 2 } + 2 \tan 18 ^ { \circ } \tan 45 ^ { \circ } \tan 72 ^ { \circ }$$

評估

$$\frac{45442351761115914888034412436150224210730415685514322476705801937969715985475404991335325292689}{15147450587038641294478415595498206962310364838504310844441344450000000000000000000000000000000}\approx 3$$

解題步驟

對題中的三角函數求值

$${(\frac{0.4663076581549986}{1.1033779189624917})} ^ {2} + {(\frac{2.1445069205095586}{2.3662015831524985})} ^ {2} + 2 \cdot 0.3249196962329063 \tan(45) 3.0776835371752527$$

同時對分子與分母乘上 10000000000000000 以展開 \frac{0.4663076581549986}{1.1033779189624917}。

$$\left(\frac{4663076581549986}{11033779189624917}\right)^{2}+\left(\frac{2.1445069205095586}{2.3662015831524985}\right)^{2}+0.3249196962329063\times 2\times 3.0776835371752527\tan(45)$$

透過找出與消去 3，對分式 \frac{4663076581549986}{11033779189624917} 約分至最低項。

$$\left(\frac{1554358860516662}{3677926396541639}\right)^{2}+\left(\frac{2.1445069205095586}{2.3662015831524985}\right)^{2}+0.3249196962329063\times 2\times 3.0776835371752527\tan(45)$$

計算 \frac{1554358860516662}{3677926396541639} 的 2 乘冪，然後得到 \frac{2416031467266655914917579622244}{13527142578377765566699460806321}。

$$\frac{2416031467266655914917579622244}{13527142578377765566699460806321}+\left(\frac{2.1445069205095586}{2.3662015831524985}\right)^{2}+0.3249196962329063\times 2\times 3.0776835371752527\tan(45)$$

同時對分子與分母乘上 10000000000000000 以展開 \frac{2.1445069205095586}{2.3662015831524985}。

$$\frac{2416031467266655914917579622244}{13527142578377765566699460806321}+\left(\frac{21445069205095586}{23662015831524985}\right)^{2}+0.3249196962329063\times 2\times 3.0776835371752527\tan(45)$$

計算 \frac{21445069205095586}{23662015831524985} 的 2 乘冪，然後得到 \frac{459890993211339028795067396683396}{559890993211339027323350679250225}。

$$\frac{2416031467266655914917579622244}{13527142578377765566699460806321}+\frac{459890993211339028795067396683396}{559890993211339027323350679250225}+0.3249196962329063\times 2\times 3.0776835371752527\tan(45)$$

將 \frac{2416031467266655914917579622244}{13527142578377765566699460806321} 與 \frac{459890993211339028795067396683396}{559890993211339027323350679250225} 相加可以得到 \frac{7573725293519320826744653583305434733489071583881254791964551016}{7573725293519320647239207797749103481155182419252155422220672225}。

$$\frac{7573725293519320826744653583305434733489071583881254791964551016}{7573725293519320647239207797749103481155182419252155422220672225}+0.3249196962329063\times 2\times 3.0776835371752527\tan(45)$$

將 0.3249196962329063 乘上 2 得到 0.6498393924658126。

$$\frac{7573725293519320826744653583305434733489071583881254791964551016}{7573725293519320647239207797749103481155182419252155422220672225}+0.6498393924658126\times 3.0776835371752527\tan(45)$$

將 0.6498393924658126 乘上 3.0776835371752527 得到 1.99999999999999938244315951584402。

$$\frac{7573725293519320826744653583305434733489071583881254791964551016}{7573725293519320647239207797749103481155182419252155422220672225}+1.99999999999999938244315951584402\tan(45)$$

從三角函數數值表格中取得 \tan(45) 的值。

$$\frac{7573725293519320826744653583305434733489071583881254791964551016}{7573725293519320647239207797749103481155182419252155422220672225}+1.99999999999999938244315951584402\times 1$$

將 1.99999999999999938244315951584402 乘上 1 得到 1.99999999999999938244315951584402。

$$\frac{7573725293519320826744653583305434733489071583881254791964551016}{7573725293519320647239207797749103481155182419252155422220672225}+1.99999999999999938244315951584402$$

將 \frac{7573725293519320826744653583305434733489071583881254791964551016}{7573725293519320647239207797749103481155182419252155422220672225} 與 1.99999999999999938244315951584402 相加可以得到 \frac{45442351761115914888034412436150224210730415685514322476705801937969715985475404991335325292689}{15147450587038641294478415595498206962310364838504310844441344450000000000000000000000000000000}。

$$\frac{45442351761115914888034412436150224210730415685514322476705801937969715985475404991335325292689}{15147450587038641294478415595498206962310364838504310844441344450000000000000000000000000000000}$$