Math Problem Statement

Work out the value of 8 sin(60°) + 18 tan(30°). Give your answer in its simplest form.

Solution

To solve the problem, let us work through each part of the expression:

Expression to evaluate:

8sin(60)+18tan(30)8 \sin(60^\circ) + 18 \tan(30^\circ)


Step 1: Recall the trigonometric values

  1. sin(60)=32\sin(60^\circ) = \frac{\sqrt{3}}{2}
  2. tan(30)=13\tan(30^\circ) = \frac{1}{\sqrt{3}}

Step 2: Substitute the values into the expression

8sin(60)+18tan(30)=8(32)+18(13)8 \sin(60^\circ) + 18 \tan(30^\circ) = 8 \left(\frac{\sqrt{3}}{2}\right) + 18 \left(\frac{1}{\sqrt{3}}\right)

Simplify each term: 8×32=43,18×13=183.8 \times \frac{\sqrt{3}}{2} = 4\sqrt{3}, \quad 18 \times \frac{1}{\sqrt{3}} = \frac{18}{\sqrt{3}}.


Step 3: Simplify the second term further

Rationalize 183\frac{18}{\sqrt{3}}: 183×33=63.\frac{18}{\sqrt{3}} \times \frac{\sqrt{3}}{\sqrt{3}} = 6\sqrt{3}.


Step 4: Combine the terms

43+63=103.4\sqrt{3} + 6\sqrt{3} = 10\sqrt{3}.


Final Answer:

103\boxed{10\sqrt{3}}

Let me know if you'd like further clarification or have additional questions!


5 Related Questions:

  1. What are the exact values of other standard trigonometric ratios like cos(30)\cos(30^\circ) and tan(60)\tan(60^\circ)?
  2. How do you rationalize a denominator in fractions involving square roots?
  3. Can you derive the values of sin(60)\sin(60^\circ) and tan(30)\tan(30^\circ) using a 30-60-90 triangle?
  4. How would this problem change if tan(30)\tan(30^\circ) was replaced by cos(30)\cos(30^\circ)?
  5. How can trigonometric identities help simplify similar expressions?

Tip:

Always memorize the key trigonometric values of angles like 3030^\circ, 4545^\circ, and 6060^\circ, as they are frequently used in problems.

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Simplification of expressions
Exact trigonometric values

Formulas

sin(60°) = √3 / 2
tan(30°) = 1 / √3
Rationalization of denominators

Theorems

Exact values of trigonometric ratios for special angles

Suitable Grade Level

Grades 9-10