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cos-trigsimp

trigsimp({1-[cos(x)]/...

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cos-trigsimp

trigsimp(2+2*cos(x));

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cos-trigsimp

trigsimp(1+cos(2*x));

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cos-trigsimp

cos (x+y), trigsimp;

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cos-trigsimp

trigsimp( (cos(x)-1 /...

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cos-trigsimp

trigsimp(cos(x)+cos(y));

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cos-trigsimp

trigsimp((1-(cos(x))/...

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cos-trigsimp

cos (x+y), trigsimp;

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cos-trigsimp

trigsimp((A+cos(w*t))...

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cos-trigsimp

trigsimp(cos(x)*cos(y));

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[cos,trigsimp]

Run Example
(%i1)trigsimp((cos(a)*cos(b)*cos(c)*cos(d) + cos(a)*cos(e)*cos(c)*cos(f) + cos(b)*cos(d)));
(%o1) cos(a) cos(c) cos(e) cos(f) + (cos(a) cos(b) cos(c) + cos(b)) cos(d)
(%i2) 
Run Example
trigsimp(cos(pi/4));
                                        pi
(%o1)                               cos(--)
                                        4
(%i2) 
Run Example
trigsimp(cos(pi/2));
                                        pi
(%o1)                               cos(--)
                                        2
(%i2) 
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