Question

find the value of sin 80°​

Answer 1

Step-by-step explanation:

Calculate sin(80)°

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:

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

sin(80) = 0.98480775273516

Write sin(80) in terms of cos

Since 80° is less than 90, we can express this in terms of a cofunction

sin(θ) = cos(90 - θ)

sin(80) = cos(90 - 80)

sin(80) = cos(10)

Answer 2

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Step-by-step explanation:

Calculate sin(80)°

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:

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

sin(80) = 0.98480775273516

Write sin(80) in terms of cos

Since 80° is less than 90, we can express this in terms of a cofunction

sin(θ) = cos(90 - θ)

sin(80) = cos(90 - 80)

sin(80) = cos(10)

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