The trigonometric attributes relate the angles of a triangle to the size of its sides. Trigonometric functions are essential in the research of regular phenomena like sound and light waves and many kind of various other applications. The many familiar 3 trigonometric ratios are sine attribute, cosine function and tangent feature. For angles less than a ideal angle, trigonometric functions are frequently identified as the ratio of two sides of a ideal triangle containing the angle and also their values have the right to be found in the size of various line segments roughly a unit circle.

You are watching: Sin -90 degrees

Sin 90 degrees = 1

The angles are calculated via respect to sin, cos and tan functions which are the main attributes, whereas cosecant, secant and also cot functions are derived from the primary functions. Normally, the degrees are taken into consideration as 0°, 30°, 45°, 60°, 90°, 180°, 270° and 360°. Here, you will certainly learn the value for sin 90 levels and just how the values are obtained together with various other levels or radian values.

Sine 90 levels value

To specify the sine function of an acute angle, start via the right-angled triangle ABC via the angle of interest and also the sides of a triangle. The 3 sides of the triangle are given as follows:


The opposite side – side opposite to the angle of interemainder.The hypotenuse side – opposite side of the ideal angle and it is always the longest side of a ideal triangleThe surrounding side – staying side of a triangle and also it creates a side of both the angle of interest and the appropriate angle

The sine feature of an angle is equal to the size of the oppowebsite side separated by the size of the hypotenuse side and also the formula is offered by

(sin heta =fracoppowebsite sidehypotenusage side)

The sine law states that the sides of a triangle are proportional to the sine of the oppowebsite angles.

(fracasin A=fracbsin B=fraccsin C)

In the following instances, the sine rule is supplied. Those problems are

Case 1: Given 2 angles and one side (AAS and also ASA)

Case 2: Given 2 sides and non contained angle (SSA)

Derivation to Find the Value of Sin 90 Degrees

Let us now calculate the worth of sin 90°. Consider the unit circle. That is the circle with radius 1 unit and its centre put in origin.


From the fundamental knowledge of trigonomeattempt, we conclude that for the provided right-angled triangle, the base measuring ‘x’ systems and the perpendicular measuring ‘y’ units.

We recognize that,

For any right-angled triangle measuring via any of the angles, sine attributes equal to the proportion of the length of the oppowebsite side to the size of the hypotenusage side. So, from the figure

(sin heta) = y/1

Start measuring the angles from the first quadrant and finish up via 90° once it reaches the positive y-axis. Now the worth of y becomes 1 since it touches the circumference of the circle. Because of this the worth of y becomes 1.

(sin heta) = y/1 = 1/1

As such, sin 90 degree equals to the fractional worth of 1/ 1.

Sin 90° = 1

The a lot of common trigonometric sine functions are

Sin 90 degree plus theta(sin (90^circ+ heta )=cos heta)Sin 90 level minus theta(sin (90^circ- heta )=cos heta)

Some other trigonometric sine identities are as follows:

(sin x=frac1csc x)(sin^2x+cos ^2x=1)(sin (-x)=-sin x)Sin 2x = 2 sin x cos x

In the very same way, we can derive other worths of sin angles favor 0°, 30°,45°,60°,90°,180°,270° and also 360°. Below is the trigonomeattempt table, which defines all the values of sine together with other trigonometric ratios.

Trigonometry Ratio Table
Angles (In Degrees)030456090180270360
Angles (In Radians)0π/6π/4π/3π/2π3π/2
tan01/√31√3Not Defined0Not Defined0
cotNot Defined√311/√30Not Defined0Not Defined
cosecNot Defined2√22/√31Not Defined−1Not Defined
sec12/√3√22Not Defined−1Not Defined1

Cos 0 Degrees

The worth of cos 0 degrees is equal to the worth of sin 90 degrees.

Sin 90° = Cos 0° = 1

Solved Examples

Concern 1: Find the worth of sin 135°.


Given, sin 135° = sin ( 90° + 45° )

= cos 45° = 1 /√2

As such, the worth of sin 135° is 1 /√2

Concern 2: Find the worth of cos 30°.


Given , cos 30° = cos ( 90° – 60° )

= Sin 60° = (fracsqrt32)Therefore, the value of cos 30° is (fracsqrt32).

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Practice Questions

Evaluate the worth of sin 90° + Cos 90°. Find the value of 2sin 90° – sec 90° What is the value of (sin 90°)/2 – sin 30°?

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