In Trig, identities are 'ultimate truths' of trigonometry. These are statements that are true regardless of the angle. Ex: sin A / cos A = tan A is true for all angles unless cos A = 0 (division by zero is undefined)
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Additive identity = 0Multiplicative identity = 1.
No. A scalar matrix is a diagonal matrix whose main diagonal elements are the same. Only if the diagonal elements are all 1 is it an identity matrix.
For addition, 0 and for multiplication, 1.
0 is the identity element of a set such that 0 + x = x = x + 0 for all elements x in the set.