Answer:
-1
Step-by-step explanation:
You have to use simultaneous linear equation as there are 2 equations given
use the subtitution method as what I've shown above
Hope you can understand well
Stay safe!
Answer:
<em>Sin 400° = Sin 40°</em>
Step-by-step explanation:
We have to find the value of the trigonometric function <em>Sin 400°</em>
Here,
Sin 400° = Sin (360° + 40°)
The picture shown below shows that in 1st quadrant <em>All trigonometric functions( Sin, Cos, Tan, Cosec, Sec, Cot ) </em> are positive.
And <em>Sin(360° + Ф°) = Sin ( Ф°)</em>
= Sin ( 40°)
Therefore, <em>Sin 400° = Sin 40°</em>
