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Assignment Expert
27.06.17, 11:01
There is an identity sin(3x)=3sin(x)-4sin^3(x), hence
sin^3(x)=(3sin(x)-sin(3x))/4 and
8sin^3(x)-6cos(x)=8(3sin(x)-sin(3x))/4-6cos(x)=6sin(x)-2sin(3x)-6cos(x).
The value of 8sin^3(40 degrees)-6cos(40 degrees) is equal to -2.47159.
Dinesh
27.06.17, 09:00
find value of 8 sin^3 40 - 6 Cos 40
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There is an identity sin(3x)=3sin(x)-4sin^3(x), hence sin^3(x)=(3sin(x)-sin(3x))/4 and 8sin^3(x)-6cos(x)=8(3sin(x)-sin(3x))/4-6cos(x)=6sin(x)-2sin(3x)-6cos(x). The value of 8sin^3(40 degrees)-6cos(40 degrees) is equal to -2.47159.
find value of 8 sin^3 40 - 6 Cos 40
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