tana-tanb=xandcotb-cota=y then prove that cot(a-b)=1/x+1/y
tana-tanb=xandcotb-cota=y then prove that cot(a-b)=1/x+1/y
sayali narkhede , 10 Years ago
Grade 11
Trigonometry> tana-tanb=xandcotb-cota=y then prove that...
1 AnswersPrsahant Parashar
1/cot a – 1/cot b=x
cot b – cot a/cot a cot b=x
y/cot a cot b=x
y/x=cot a cot b
cot(a-b)=cota cotb+1/cotb-cota
=y/x+1/y
=(y+x)/x/y
=1/x+1/y
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