Question

prove that 1-2sin^2 30=cos^2 60​

Answer 1

Answer:

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Step-by-step explanation:

cos60°=

2

1

⇒1−2sin

2

30°=1−2(

2

1

)

2

=1−

2

1

=

2

1

⇒2cos

2

30°−1=2(

2

3

)

2

=

2

3

−1=

2

1

∴cos60°=1−2sin

2

30°=2cos

2

30°−1