Mathcad simplify tool ->Sin(t)^2+Cos(t)^2

[Ackurdeeve]

I am a beginner. When I try to solve a  differential equation problem, the "simplify" tool can not recognize the Sin(t)^2+Cos(t)^2=1. I have to simplify the equation manually.

The attach file shows how I do this now. Is there a solution that Mathcad can handle the identity relation Sin(t)^2+Cos(t)^2=1.?

[ttokoro · Accepted solution]

t must have same label. 

[Ackurdeeve]

In this equation, it is not simplified

[Ackurdeeve]

Ok. I know the problem. The label t seems to be the same but in different fonts. I change it by typing in English and it solved.

[ValeryOchkov]

More correct