How do i solve this without a calc;

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- October 13th 2008, 06:18 PMFlexibleQuick question
How do i solve this without a calc;

- October 13th 2008, 06:52 PMFlexible
I'm having a problem when i can't cancel the -2 and the cosB, for example;

From the cosine rule to find the area of a triangle:

Here i can just cancel the and as

The problem arises when i cant cancel these two components so what do i do? For example;

- October 14th 2008, 02:21 AMFlexible
anyone?