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The exact value of sin 90 degrees is equal to 1.

Sin 25 degrees is the value of sine trigonometric function for an angle equal to 25 degrees. The value of sin 25° is 0.4226 (approx).

⇒ 25 degrees = 25° × (π/180°) rad = 5π/36 or 0.4363 . . . Explanation: For cos 25 degrees, the angle 25° lies between 0° and 90° (First Quadrant). Since cosine function is positive in the first quadrant, thus cos 25° value = 0.9063077. . .

The value of sin 30 degrees is 0.5. Sin 30 is also written as sin π/6, in radians. The trigonometric function also called as an angle function relates the angles of a triangle to the length of its sides.Jul 2, 2020

Sin 20 degrees is the value of sine trigonometric function for an angle equal to 20 degrees. The value of sin 20° is 0.342 (approx).

The value of sin 35° is equal to the y-coordinate (0.5736). ∴ sin 35° = 0.5736.

Using trigonometric identities, we can write cot 25° in terms of sin 25° as, cot(25°) = √(1 - sin²(25°))/sin 25° .

The value of cos 35 degrees can be calculated by constructing an angle of 35° with the x-axis, and then finding the coordinates of the corresponding point (0.8192, 0.5736) on the unit circle. The value of cos 35° is equal to the x-coordinate (0.8192). ∴ cos 35° = 0.8192.

Note: Since 30° lies in the 1st Quadrant, the final value of sin 30° will be positive. We can use trigonometric identities to represent sin 30° as, sin(180° - 30°) = sin 150°