In any triangle `A B C` , prove that following :`(a+b)/c=(cos((A-B)/2))/(sin(C/2))`

In a Triangle ABC, prove that: cos(A+B/2)=sin C/2

Prove that (a - b)² cos²C/2 + (a + b)² sin²C/2 = c²

If A+B+C=180° then prove that sinA+sinB+sinC=4cos(A/2)cos(B/2)cos(C/2)

In `traingle ABC` , prove that `cos ((A-B)/(2))=((a+b)/(c)sin.(C)/(2)`.

If A, B and C are interior angles of a triangle. Show that sin(B+C)/2 = cos A/2

sin⁡A+sin⁡B+sin⁡C=4 cos⁡(A/2)cos⁡(B/2)cos⁡(C/2), cos⁡A+cos⁡B+cos⁡C=1+ 4 sin⁡(A/2)sin⁡(B/2)sin⁡(C/2)

Prove that :- (a + b) sinC/2 = c cos(A - B)/2

CBSE 12 Mathematics PYQ's | Vectors | Most important PYQ's | CBSE 12 Board Exam 2025 Preparation - 2

Properties of Triangle: (a+b)/c = Cos ((A-B)/2) / Sin C/2

For any triangle ABC, prove that `(a+b)/c=(cos((A-B)/2))/(sinC/2)`...

Trigonometry Class 11 | CosA + CosB + CosC = 1 + 4 Sin(A/2) Sin(B/2) Sin(C/2)

If `A+B+C=pi`, prove that : `sinA+sinB+sinC= 4cos( A/2 )cos( B/2) cos(C/2)`

∆ABC में सिद्ध कीजिए cos((A+B)/2)=sin C/2 | त्रिभुज ABC में सिद्ध कीजिए cos((A+B)/2)=sin C/2

If A, B, C are angles of a triangle, prove that cos²A/2 + cos²B/2 - cos²C/2 = 2cosA/2.cosB/2.sinC/2

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Prove that sina+sinb=2sin(a+b)/2cos(a-b)/2 Trigonometric Identities(Hindi)

SINC + SIND = 2 SIN (C+D)/2 COS (C-D)/2 | COSC + COSD = 2 COS (C+D)/2 COS (C-D)/2 | TRIGONOMETRY

12a) If A+B+C=πᶜ, prove that cos(B+ 2C)+cos(C+2A)+cos(A+2B) = 1-4cos(A-B)/2. cos(B-C)/2.cos(C-A)/2

Prove that cosA + cosB + cosC = -1 + 4cosA/2 cosB/2 sinC/2 | EDUTAINMENT ONLINE