## Cos3x Formula in terms of Cosx, Sinx [with Proof]

Cos3x formula in terms of cosx is as follows: 4cos3x-3cos x. In this post, we will also derive the cos3x formula in terms of sinx and give some examples. These formulas are very useful to solve trigonometric equations and simplify trigonometric expressions. Cos3x Formula Cos3x is the cosine function of a triple angle 3x. The … Read more

## Tan2x Formula in terms of Tanx, Sinx, Cosx [with Proof]

Tan2x formula in terms of tanx is as follows: $\dfrac{2\tan x}{1-\tan^2x}$. Here, we will also derive the tan2x formula in terms of sinx and cosx along with some examples. These formulas are very useful to solve trigonometric equations and simplify trigonometric expressions. Tan2x Formula Tan2x is the tangent function of a double angle 2x. The … Read more

## Sin3x Formula in terms of sinx [with Proof]

Sin3x formula in terms of sinx is as follows: 3sinx – 4sin3x. The formula can be expressed as sine 3x = 3 sine x – 4 sine cube x. In this post, we will learn how to prove sin3x formula along with some examples. This is very useful in the area of Trigonometry to solve … Read more

## Values of sin 75, cos 75, tan 75 | sin 75 cos 75

In this post, we will find the value of sin 75 degree, cos 75 degree, and tan 75 degree. They are very important in Trigonometry. Using their values, we are able to find the trigonometric values of many angles. We will now find the value of sine 75 degree. Value of sin 75 Answer: The … Read more