about trigreduce

• Subject: about trigreduce
• From: kun
• Date: Wed, 25 Apr 2012 12:09:43 +0800 (CST)

Hello everyone,

I entered the following line into Maxima:
trigreduce(cos(la)*cos(u)*sin(v)*R - sin(la)*cos(u)*cos(v)*R);


I expect:
sin(v-la)*cos(u)*R

but Maxima returned:
?sin(v + u - la) R ? sin(v - u - la) R
? ----------------- + -----------------
? ? ? ? ? ? ?2 ? ? ? ? ? ? ? ? ? 2

how can I get my wanted result?

Regards,

Kun

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