Respuesta :

Answer:

√3/2

Step-by-step explanation:

p/h=1/2

Using Pythagoras Theorem

b=√3

cos=√3/2

cos20= √3/2*20

= 10√3

Answer:

cos2θ = [tex]\frac{1}{2}[/tex]

Step-by-step explanation:

Using the identity

cos2θ = 1 - 2sin²θ

          = 1 - 2([tex]\frac{1}{2}[/tex] )²

          = 1 - 2([tex]\frac{1}{4}[/tex] )

          = 1 - [tex]\frac{1}{2}[/tex]

          = [tex]\frac{1}{2}[/tex]

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