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OpenStudy (anonymous):
pls help.... prove: tan 70° = tan 20° + 2tan 50°
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OpenStudy (anonymous):
I think the ans required is ......... tan(70-20)=tan50 tan70-tan20/1+tan20 tan70=tan50 tan20 tan70=cot70 tan70=1 tan70-tan20/2=tan50 tan70-tan20=2tan50 tan70=tan20+2tan50
OpenStudy (anonymous):
if the ans is satisfactory, pls click GOOD ANSWER button ( :))
OpenStudy (anonymous):
tnx a lot.... :)
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