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Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder ( ! : ”0 )

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?