Question 4.2.8: Evaluating Trigonometric Functions with a Calculator Use a c...
Evaluating Trigonometric Functions with a Calculator
Use a calculator to find the value to four decimal places:
a. cos \frac{π}{4} b. cot 1.2.
Scientific Calculator Solution
\begin{matrix}&\text{Function}&\text{Mode}&\text{Keystrokes}&&\text{Display, Rounded to Four Decimal Places}\\\\\text{a.}&\cos\frac{π}4 &\text{Radian}& π \ \fbox{÷} 4 \ \fbox{=} \ \fbox{COS}&&0.7071\\\\\text{b.}&\cot 1.2& \text{Radian}&1.2 \ \fbox{ TAN } \ \fbox{1/x} &&0.3888\end{matrix}Graphing Calculator Solution
\begin{matrix}&\text{Function}&\text{Mode}&\text{Keystrokes}&&\text{Display, Rounded to Four Decimal Places}\\\\\text{a.}&\cos\frac{π}{4}&\text{Radian}&\fbox{COS}\fbox{(} π \fbox{÷} 4 \ \fbox{)}\fbox{ENTER}&&0.7071\\\\\text{b.}&\cot 1.2& \text{Radian}&\fbox{(} \ \fbox{ TAN } \ 1.2 \ \fbox{)} \ x^{-1} \ \fbox{ENTER}&&0.3888\end{matrix}Related Answered Questions
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