Cos square 30 degree minus sin square 30 degree is equals to 1 minus 2 sin square 30 degree

see explanation

Step-by-step explanation:

Not sure quite what you are asking, but

Using the trigonometric identity

cos² x = 1 - sin²x, then

cos²x - sin²x

= 1 - sin²x - sin²x

= 1 - 2sin²x

Thus

cos²30° - sin²30° = 1 - 2sin²30°

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

fahrenheit

step-by-step explanation:

fahrenheit is more precise than celsius. the ambient temperature on most of the inhabited world ranges from -20 degrees fahrenheit to 110 degrees fahrenheit—a 130-degree range. on the celsius scale, that range is from -28.8 degrees to 43.3 degrees—a 72.1-degree range. this means that you can get a more exact measurement of the air temperature using fahrenheit because it uses almost twice the scale.