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? asked in Science & MathematicsMathematics · 9 years ago

Use the unit circle to find each value,how?

The problem says, sin 90*

There's also one that's cot (-270*) but since that is the opposite of tangent is it 270? I don't know, help is appreciated.

*degrees

1 Answer

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  • Can Khon Nhat Sa
    Lv 6
    9 years ago
    Favorite Answer

    90º is at the north

    sin90º = 1

    -270º is starting from east, go clockwise direction and stop at north or it is 90º.

    cot(-270º) = cos(-270º)/(sin(-270º)

    = cos90º/sin90º = 0

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