i have this problem in the picture below ...can u help me about the problem??

i have this problem in the picture below

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can u help me about the problem??

Answer 1

[Greg Dionne]

sin(x) and cos(x) require parentheses about their arguments.

So you need to say sin(u(3)) and cos(u(3))

[ahmed altaee]

i did it and stay the same problem

[Greg Dionne]

That looks fine to me. Maybe there's something else nearby or u() and g are not defined like you think they are? Good luck.