y=4sin(πx/8+π/4-π)怎样变成y=-4sin(πx/8+π/4)过程~

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y=4sin(πx/8+π/4-π)怎样变成y=-4sin(πx/8+π/4)过程~y=4sin(πx/8+π/4-π)怎样变成y=-4sin(πx/8+π/4)过程~y=4sin(πx/8+π/4-

y=4sin(πx/8+π/4-π)怎样变成y=-4sin(πx/8+π/4)过程~
y=4sin(πx/8+π/4-π)怎样变成y=-4sin(πx/8+π/4)过程~

y=4sin(πx/8+π/4-π)怎样变成y=-4sin(πx/8+π/4)过程~
y=4sin(πx/8+π/4-π)怎样变成y=-4sin(πx/8+π/4)
y=4sin{-[π-(πx/8+π/4)]}(把[π-(πx/8+π/4)]看作α)
=-4sin[π-(πx/8+π/4)](这里用了sin(-α)=-sinα的公式)
=-4sin(πx/8+π/4)(把(πx/8+π/4)看作α,然后用sin(π-α)=sinα的公式).