lnkhprovip2514 lnkhprovip2514

19-01-2021
Mathematics

contestada

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

Respuesta :

jimrgrant1 jimrgrant1

19-01-2021

Answer:

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°

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