bjr
x -π - π/2 0 π/2 π
cosx -1 - 0 + 1 + 0 - -1
sinx 0 - -1 - 0 + 1 + 0
cosx*sinx + - + -
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bjr
x -π - π/2 0 π/2 π
cosx -1 - 0 + 1 + 0 - -1
sinx 0 - -1 - 0 + 1 + 0
cosx*sinx + - + -