Home
Class 12
MATHS
Show that sum(b+c)cosA=2s Prove that (b+...

Show that `sum(b+c)cosA=2s` Prove that `(b+c)cosA+(c+a)cosB+(a+b)cosC=a+b+c`

Text Solution

Verified by Experts

The correct Answer is:
`2s=R.H.S`
Promotional Banner

Topper's Solved these Questions

  • PROPERTIES OF TRIANGLES

    SRISIRI PUBLICATION|Exercise LAQ|20 Videos

  • PRODUCT OF VECTORS

    SRISIRI PUBLICATION|Exercise SPQ|15 Videos

  • QUESTION PAPER

    SRISIRI PUBLICATION|Exercise SECTION - C|36 Videos

Similar Questions

Explore conceptually related problems

Show that (c-bcosA)/(b-c"cos"A)=(cosB)/(cosC)

Show that 2("bc"cosA+"ca"cosB+"ab"cosC)=a^(2)+b^(2)+c^(2).

Prove that (a)/(bc)+(cosA)/(a)=(b)/(ca)+(cosB)/(b)=(c)/(ab)+(cosC)/(c)

Show that a cosA+bcosB+c"cos"C=(2Delta)/(R)

Prove that {:[( b+c,a,a), ( b,c+a,b),( c,c,b+a) ]:}

Show that sum sin (B + C) sin (B - C) = 0

If Delta ABC , show that sum (b+c) cos A = 2s .

In DeltaABC, c (a cosB-b cosA)=