Question

what is the value of sin 21​

Answer 1

Calculate sin(21)°

Determine quadrant:

Since our angle is between 0 and 90 degrees, it is located in Quadrant I

In the first quadrant, the values for sin, cos and tan are positive.

Determine angle type:

21 is an acute angle since it is less than 90°

sin(21) = 0.35836794915431

Write sin(21) in terms of cos

Since 21° is less than 90, we can express this terms of a cofunction

sin(θ) = cos(90 - θ)

sin(21) = cos(90 - 21)

sin(21) = cos(69)

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Answer 2

Answer:

Exact Form:

sin(21)

Decimal Form: 0.35836794...

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