If in a triamgle ABC, `theta` is the angle determined by `cos theta=(a-b)//c`, then

If in a triangle ABC, theta is the angle determined by cos theta=(a-b)//c , then

In a triangleABC"if c"=(a+b) sin theta and cos theta=(ksqrtab)/(a+b)," then "k=

If theta is any real number, then, in a triangle ABC, prove that a cos (B - theta) + b cos (A + theta) = c cos theta .

In a triangle ABC, prove that for any angle theta,b cos(A-theta)+a cos(B+theta)=C cos theta

If the angle theta is acute, then the acute angle between x^(2)(cos theta-sin theta)+2xy cos theta+y^(2)(cos theta+sin theta)=0, is

If theta is parameter, A=(a cos theta,a sin theta) and B=(b sin theta,-b cos theta)C=(1,0) then the locus of the centroid of Delta ABC

If theta and phi are acute angle related by a sec theta+b sec phi=c;a,b,c>0, then a cos theta+b cos phi is

If 2 theta is an acute angle, then the acute angle between the two lines x^(2)(cos theta-sin theta)+2xy.cos theta +y^(2)(cos theta +sin theta)=0 is