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Verify that the equation is an identity. (Hint: sin 2x = sin (x + x)) sin 2x = 2 sin x cos x Substitute 2x = x + x and apply the sine of a sum identity. sin 2x = sin (x + x) = 0 (Do not simplify.) Verify the identity. cos (a + B) + cos (a - B) = 2 cos a cos B Write the left side of the identity using the sum and difference formulas. (Type the terms of your expression in the same order as they appear in the original expression.) Verify the identity. tan (2x - 0) = - tan 0 Write the left side of the identity using either the sum or difference formula for tangent. Verify the identity. sin 2 - 0 = - cos 0 Write the left side of the identity using a sum or difference formula for sine or cosine. (Do not simplify.)