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sums and differences of angles (1 Viewer)

S

spakfilla

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Solve (show working)

tan (x+y) + tan (x-y)
1- tan (x+y) tan (x-y)


I forget!!!!
 
F

fullonoob

fail engrish? unpossible!
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tan (x+y) + tan (x-y) / 1- tan (x+y) tan (x-y)

= tan [(x+y) + (x-y)] , using tan (A+B) = tanA + tanB / 1-tanAtanB
= tan (2x)
 
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