Question

The equation sinx=(sqrt2)/2 is an identity.

True or False?

Answer 1

I want to say false, could anyone verify?

Answer 2

@jim_thompson5910

Answer 3

definitely false, since sine is a function, not a number

Answer 4

Ah, thank you! :D

Answer 5

it's only true for specific x values but not all x values

it needs to be a true equation for every value in the domain for it to be an identity

Answer 6

examples

2 = 2 is an identity since it's always true

x = x is also an identity (domain: All real numbers)

tan(x) = tan(x) is an identity (domain: all real numbers but x can't equal multiples of pi/2)

Answer 7

Thank you for the explanation, it makes much more sense now ^_^