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Trigonometry PROBLEM! (1 Viewer)

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whackymac

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This question 'popped' out while i was learning how to change sum into products. There seem to be no identities to this question.


Expressed this term in products.

1) sina - cosb


Need help on this question. Show the working out please :)
 
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lolokay

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change sina to cos(90-a) or cosb to sin(90-b)
 
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