examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Geometry
# Sum and Difference Trigonometric Formulas

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

If \(\sin\theta= \cos\theta\), find the value of \(\cos 2\theta\).

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Parth Lohomi**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

If \(A + B = 225^{\circ}\), find \((1+\tan A)(1+\tan B),\) where defined.

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Omkar Kulkarni**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

\[\large \frac {1}{\cos 80^\circ } - \frac {\sqrt 3}{\sin 80^\circ } = \ ? \]

**Hint:** How can we write the numerators in relation to common trig values?

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Gagan Raj**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Pratik Shastri**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

\[ \sin^2 18^ \circ + \sin ^2 30 ^ \circ. \]

Which of the following is equal to the above expression?

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Calvin Lin**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

×

Problem Loading...

Note Loading...

Set Loading...