(in) cos 30 = 4 cos - 3 cos 0
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Answered by
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Step-by-step explanation:
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Answered by
0
Answer:
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Step-by-step explanation:
Now, LHS=cos2(30
o
)=cos90
o
=0
Now, RHS=4cos
3
θ−3cosθ=4(
2
3
)
3
−3(
2
3
)=(
2
3
3
)−(
2
3
3
)=0
∴ LHS=RHS
Hence proved
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