Question

cos²20-sin²20=? How to solve? ​

Answer 1

Answer:

cos² 20° + sin² 20° = 1

Step-by-step explanation:

'Use property:

cos²θ + sin²θ = 1

So,

cos² 20° + sin² 20° = 1

Answer 2

• sin²A + cos²A = 1
• then ,
• -sin²A + cos²A = -1
• then ,
• cos²20° - sin²20° = 1

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