The cos value when angle of a right triangle equals to $90^°$ is called cosine of angle $90$ degrees. Mathematically, it is written as $\cos{(90^°)}$ as per sexagesimal system.

$\cos{(90^°)} \,=\, 0$

The cosine of angle $90$ is exactly equal to zero and it is often called as trigonometric ratio (or function) of standard angle.

The $\cos{(90^°)}$ can be written alternatively in two different forms. It is written as $\cos{\Big(\dfrac{\pi}{4}\Big)}$ in circular system and also written as $\cos{(100^g)}$ in centesimal system.

$(1) \,\,\,$ $\cos{\Big(\dfrac{\pi}{2}\Big)} \,=\, 0$

$(2) \,\,\,$ $\cos{(100^g)} \,=\, 0$

Now, learn how the exact value of cos of angle $90$ degrees is equal to zero mathematically in trigonometry.

Latest Math Topics

Latest Math Problems

Email subscription

Math Doubts is a free math tutor for helping students to learn mathematics online from basics to advanced scientific level for teachers to improve their teaching skill and for researchers to share their research projects.
Know more

Learn how to solve easy to difficult mathematics problems of all topics in various methods with step by step process and also maths questions for practising.