In right triangle `ABC. B C=7c m ,A C-A B=1cm and angleB=90^@.` The value of `cos A+cosB + cosC` is :

ABC is a right angled triangle with angleA=90^(@) .Then the value of cos^(2)A+cos^(2)B+cos^(2)C is :

In Delta ABC right-angled at B, AB = 7 cm and AC - BC = 1 cm , Find the values of sin C and cos C.

In a Delta ABC,angle B=90^(@),AB=7cm and (AC-BC)=1cm , find the values of sin A , cos A, sin C and C.

In Delta ABC, /_ B = 90^(@), BC = 5cm and AC - AB = 1 cm. Find the value of sinC and cos C.

In triangle ABC if a,b and c are in arithmetic progression then cos A + 2cosB + cosC=

Prove that b cosB + c cosC = a cos ( B-C)

In Delta ABC , right - angled at B, AB = 24 cm, BC = 7cm . Determine : (i) sin A, cos A (ii) sin C, cos C

If any triangle ABC, a=18,b=24,c=30 cosA,cosB,cosC

In a triangle ABC , if (b+c) / 11 = (c+a) / 12 = (a+b) / 13 then cosA / l = cosB / m = cosC / n where l, m, n are least positive integer. Find the value of (l+m+n) .