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why sin30=1/2
cosx +cosy=a
sinx-siny=b
squarring bot the equation then subtrac
cos2x+cos2y+2cox(x-y)=a2-b2
2cos(x-y)[1+cos(x+y)]=a^2-b^2 (o)
now squarring above equation then add
cos(x+y)=(a^2+b^2)/2-1
now put the valu of cos(x+y) in (o)
cos(x-y)=a2 -b2/a2+b2
what is range of
F(x)=1/(3-5cosx)
what is area of triangle with sides 1-(x^1/2),5-(x^1/2),7-(x^1/2)
what is eaist method to solve it
hi carisma
point of inflection is that point where a function changes its nature i.e(it changes its sign from + to - & vice versa)
or mathmatically you can say doubble derivative zero or does not exist at that point
2nd derivative does not exist means in the graph of frist derivative there will be sudden change at that point
in your Q. f(x)= e^(-2x^2)
f"(x)=0 at x=1/2,-1/2
according to condition x=-1/2 is point of inflection
if "3x+4y+5z=12"
then what is minimum valu of x^2+y^2+z^2