Question

If sin A = 45°, then 1-2 sin²A =​

Answer 1

sin A = 45°

then 1 - 2sin²A = 1 - 2 sin²45°

since the value of sin 45° is 1/√2

therefore , 1 - 2 ( 1/√2 )² = 1 - 2 ( 1/2 )

= 1 - 1 = 0

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