examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Back to all chapters
# Sum and Difference Trigonometric Formulas

These formulas explain how to add and subtract trigonometric functions (and their arguments). If you've got sum time, see what a difference these formulas will make for your trig toolkit.

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

\[ \large \dfrac{\cot^375^{\circ}+\tan^375^{\circ}}{\cot75^{\circ}+\tan75^{\circ}} = \ ? \]

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Khang Nguyen Thanh**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

\[\large \dfrac{\sin^2 (3A)}{\sin^2 (A)}-\dfrac{\cos^2 (3A)}{\cos^2 (A)}=2 \]

\[ \implies \large \cos (2A)= \ ? \]

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Ikkyu San**

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
**
Omkar Kulkarni**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

\[ \large \tan(63^\circ) = \sqrt{\sqrt a-\sqrt b} + \sqrt{\sqrt c-\sqrt b} \]

The equation above is true for positive integers \(a,b,c\). What is the value of \(a+b+c\)?

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Pi Han Goh**

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
**
Mehul Chaturvedi**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

×

Problem Loading...

Note Loading...

Set Loading...