Answer:
Sin 400° = Sin 40°
Explanation:
We have to find the value of the trigonometric function Sin 400°
Here,
Sin 400° = Sin (360° + 40°)
The picture shown below shows that in 1st quadrant All trigonometric functions( Sin, Cos, Tan, Cosec, Sec, Cot ) are positive.
And Sin(360° + Ф°) = Sin ( Ф°)
= Sin ( 40°)
Therefore, Sin 400° = Sin 40°