Question

plz please plz help........​

Answer 1

cos60° = {1/2} [ because cos60° = 1/2 ]

= 1/2

2cos²30° - 1 = 2 × {√3/2}² - 1 [ because cos30°=√3/2]

= 2 × 3/4 - 1 = 3/2 - 1 = 1/2

here it is clear that, cos60° = 2cos²30° - 1

Hope it helps you ☺️,

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Answer 2

Answer:

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