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Solution 4.3:3a

From Förberedande kurs i matematik 1

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The angle <math>-v</math> is the reflection of the angle <math>v</math> in the ''x''-axis, and under such reflection the ''x''-coordinate does not change, whereas the ''y''-coordinate changes sign. This means that if <math>\sin v = a\,</math>, then <math>\sin (-v) = -a\,</math>.
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Current revision

The angle −v is the reflection of the angle v in the x-axis, and under such reflection the x-coordinate does not change, whereas the y-coordinate changes sign. This means that if sinv=a, then sin(−v)=−a.

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