Math Problem Statement

  1. Show that: (a) sin 30° + cos 45° =

Solution

We will evaluate the trigonometric values for each angle:

  1. sin30=12\sin 30^\circ = \frac{1}{2}
  2. cos45=22\cos 45^\circ = \frac{\sqrt{2}}{2}

Now, add these two values:

sin30+cos45=12+22\sin 30^\circ + \cos 45^\circ = \frac{1}{2} + \frac{\sqrt{2}}{2}

Since the denominators are the same, you can combine the numerators:

=1+22= \frac{1 + \sqrt{2}}{2}

Thus, the final answer is:

1+22\boxed{\frac{1 + \sqrt{2}}{2}}

Would you like a more detailed breakdown of how I arrived at this?

Here are some related questions:

  1. What is cos30+sin45\cos 30^\circ + \sin 45^\circ?
  2. How do you simplify sin60+cos30\sin 60^\circ + \cos 30^\circ?
  3. What is the exact value of sin45+cos60\sin 45^\circ + \cos 60^\circ?
  4. How do trigonometric values of standard angles relate to the unit circle?
  5. Can you derive trigonometric values using right triangles?

Tip: Knowing standard trigonometric values (e.g., 30°, 45°, 60°) helps solve many problems quickly.

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Standard Angles

Formulas

sin 30° = 1/2
cos 45° = √2/2

Theorems

Trigonometric Functions of Standard Angles

Suitable Grade Level

Grades 8-10