Question

1-cos² A is equal to​

Answer 1

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1 - Cos² a = Sin² a .

Sin² x + Cos² x = 1Square of Sine and Cosine is always equal to 1.

Therefore, 1 - Cos² a = Sin² a .

You can use this too.

Cos²(a/2) - Sin² (a/2) = Cos a

There can be various forms, go through Trigonometric Identities.