1.

. If sin = 1/2, then show that 3cos - 4cos3 = 0.​

Answer»

Answer:

GIVEN sinθ=

2

1

⟹θ=

6

π

LHS

=3cosθ−4cos

3

θ=3cos

6

π

−4cos

3

6

π

=

2

3

3

−4(

2

3

)

3

=

2

3

3

−4×

8

3

3

=

2

3

3

2

3

3

=



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