Give the following products in polar form: ` [2(cos 210^0+isin210^0)][4(cos120^0+isin120^0)] `

Give the following products in polar form: [3(cos 225^0+i sin225^0)] [6(cos 45^0 + i sin 45^0)]

Give the following quotients in polar form: (9(cos90^0+isin90^0))/(3(cos45^0+isin45^0)

Write down the following complex number in polar form: Product of 2 (cos 30^0+isin 30^0) and 3 (cos 90^0+isin90^0)

Change the following complex numbers to Cartesiasn form: 2(cos0^0+isin0^0)

Write down the following complex number in polar form: Quotient of 12 (cos 150^0 + i sin 150^0) and 3(cos 60^0+i sin 60^0)

Find the value of : cos 210^0

Change the following complex numbers to Cartesiasn form: 4(cos300^0+isin300^0)

Find the values of the following trigonometric ratio: cos210^0

Prove that: sin 780^0sin 480^0+cos 120^0sin 150^0=1/2

Prove that: t a n 720^0-cos 270^0-sin 150^0cos 120^0=1/4