if A+B+C=180degrees, prove that 2sin(B+C)sinA=1-cos2A

if A+B+C=180degrees, prove that 2sin(B+C)sinA=1-cos2A
1. 3 answers
2. asked by Sarah
3. 570 views
how do you solve this.prove: cos2A plus cosA divided by sin2A minus sinA equal to cos2A plus 1 divided by sinA
1. 1 answer
2. asked by lungisile ntobela
3. 1,156 views
Prove:1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA
1. 1 answer
2. asked by Piwo
3. 610 views
Prove:1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA
1. 1 answer
2. asked by Piwo
3. 1,201 views
Prove :1 + Sin2A/ Cos2A = CosA + SinA / CosA- SinA
1. 5 answers
2. asked by clive
3. 2,495 views
Let A=(cosA -sinA)(sinA cosA) show that A^2=(cos2A sin2A) (sin2A cos2A)
1. 1 answer
2. asked by James
3. 642 views
In any angle ABC prove that the perimeter = a/Sin A(Sin A + Sin B + Sin C)Start with perimeter = a+b+c but b= aSinB/sinA and c=
1. 0 answers
2. asked by Anonymous
3. 535 views
sina=3/5, pi/2<a<pi evaluate cos2a
1. 1 answer
2. asked by Anonymous
3. 545 views
If sinA=0.5 , what is the value of cos2A and sin2A?
1. 1 answer
2. asked by Partha banerjee
3. 1,464 views
Verify/prove the following:(sinA+tanA)/(1+secA) = sinA ______________________________ tanu = 1+sinu-cos^2u/cosu(1+sinu)
1. 1 answer
2. asked by Kid
3. 735 views