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

  1. if A+B+C=180degrees, prove that 2sin(B+C)sinA=1-cos2A
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    2. Sarah asked by Sarah
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  2. how do you solve this.prove: cos2A plus cosA divided by sin2A minus sinA equal to cos2A plus 1 divided by sinA
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    2. lungisile ntobela asked by lungisile ntobela
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  3. Prove:1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA
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    2. Piwo asked by Piwo
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  4. Prove:1/cos2A+sin2A/cos2A=sinA+cosA/cosA-sinA
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    2. Piwo asked by Piwo
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  5. Prove :1 + Sin2A/ Cos2A = CosA + SinA / CosA- SinA
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    2. clive asked by clive
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  6. Let A=(cosA -sinA)(sinA cosA) show that A^2=(cos2A sin2A) (sin2A cos2A)
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    2. James asked by James
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  7. 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=
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    2. Anonymous asked by Anonymous
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  8. sina=3/5, pi/2<a<pi evaluate cos2a
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    2. Anonymous asked by Anonymous
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  9. If sinA=0.5 , what is the value of cos2A and sin2A?
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    2. Partha banerjee asked by Partha banerjee
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  10. Verify/prove the following:(sinA+tanA)/(1+secA) = sinA ______________________________ tanu = 1+sinu-cos^2u/cosu(1+sinu)
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    2. Kid asked by Kid
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