2.Prove that, `|[265,240,219],[240,225,198],[219,198,181]|=0`

The value of Delta by using the properties of determinant where Delta = |{:(265,240,219),(240,225,198),(219,198,181):}| is

Without expanding evaluate the determinant =|(265, 240, 219), (240, 225, 198), (219, 198 ,181)| .

If cos theta=-1/2 and 0^@ < theta < 360^@ then the solutions are a. 60^@, 240^@, b.120^@, 240^@, c.120^@, 210^@, d.120^@, 300^@

Prove that: sin780^0sin 120^0+cos 240^0sin390^0=1/2

For the reaction A_(2)(g)+(1)/(8)B_(8)(g)rarrA_(2)B(g) following data was obtained for a large concentration of B_(8) . What is the reaction order with respect to A_(2) ? {:("Time (min)",,[A_(2)]("moles"//L)xx10^(4)),(60,,292),(120,,198),(180,,104),(240,,010):}

Prove that: tan(-225^0)cot(-405^0)-tan(-765^0)cot(675^0)=0

Prove that: t a n 225^0cot 405^0+t a n 765^0cot 675^0=\ 0

Given A=[{:(2,4,0),(3,9,6):}] "and" B=[{:(1,4),(2,8),(1,3):}] , is (AB)=B'A'?

If y=[x+sqrt(x^2-1)]^(15)+[x-sqrt(x^2-1)]^(15) then prove that (x^2-1)(d^2y)/(dx^2)+x(dy)/(dx)-225y=0

Prove that tan225^(@)cot405^(@)+tan765^(@)cot675^(@)=0