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Question: combine while excluding a variable

Question:combine while excluding a variable

digerdiga 390 Maple 17
simplify combine freeze
December 14 2017
1

I have this expression:

-sin(alpha)*(sin(theta1)*cos(theta)-cos(theta1)*sin(theta))

which can be combined using a trigonmetric formula...

However when using combine() it also tried to sneak alpha into the result...

Is it possible to freeze the variable alpha when combining?
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