Question

If A=30° prove that:2cos²A-1=1-2sin²A​

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

2(cos 30)^2-1=1-2(sin 30)^2

2×[√3/2]^2-1=1-2[1/2]^2

2×(3/4)-1=1-2×(1/4)

3/2-1=1-1/2

1/2=1/2