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Standard X
Mathematics
Trigonometric Ratio(sin,cos,tan)
Prove that co...
Question
Prove that cos6x= 32cos
6
x-48cos
4
x+18 cos
2
x-1
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Solution
cos6x=cos[2(3x)]=2cos2(3x)-1 cos2x=2cos2x-1
=2[cos(3x)]2-1 cos3x=4cos3x-3cosx
=2[4cos3x-3cosx]2-1 (a-b)2=a2+b2-2ab
=2[16cos6x+9cos2x-24cos4x]-1
=32cos6x-48cos4x+18cos2x-1
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Q.
Prove that:
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Prove the following:
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Solve:
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