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Question: RE: Trogonomatric identity

Question:RE: Trogonomatric identity

pik1432 245 Maple
simplification trig
October 07 2020
1

Hello all, 

Would you allow me to ask this question?

Is there a way to make the expression 'expression1', given below, to expression 'expression3'?


 

> 

restart;
> 

expression1 := -cos(theta)/2 + sin(theta)*sqrt(3)/2;

-(1/2)*cos(theta)+(1/2)*sin(theta)*3^(1/2)

 (1)
> 

expression2 := expand(cos(theta-2/3*Pi));

-(1/2)*cos(theta)+(1/2)*sin(theta)*3^(1/2)

 (2)
> 

is(expression1 = expression2);

true

 (3)
> 

expression3 := cos(theta-2/3*Pi);

-cos(theta+(1/3)*Pi)

 (4)
> 

 


Thank you, 

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