Question

5 cos² 60 - 5 sin² 30 = ?​

Answer 1

Answer:

5 cos²60 - 5 sin²30

= 5 × 1/4 - 5 × 1/4

= 5/4 - 5/4

= 0

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Answer 2

Step-by-step explanation:

5×(1/2)^2-5×(1/2)^2

5×1/4-5×1/4

5/4-5/4=0