Do u need to know these trig identities (1 Viewer)

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darkphoenix

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Just wondering, for 4 unit, do u need to remember Product-to-Sum Formulas and Sum-to-Product Formulas in trig identities. Thanks
 
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SpiralFlex

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You should at least know how to derive them. :)

They will "guide" you into doing that anyway.
 
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iSplicer

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darkphoenix said:
Just wondering, for 4 unit, do u need to remember Product-to-Sum Formulas and Sum-to-Product Formulas in trig identities. Thanks
Click to expand...
You need to know that they exist, that they're useful in sticky situations and how to derive them.

Don't bother memorising.
 
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