anonymous
  • anonymous
Use identities (no calculators) to find the exact value for (sin 15)(cos 45) + (cos 15)(sin 45).
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
This is the 'addition angle formula \[sin(a+b)=sin(a)cos(b)+cos(a)sin(b)\]
anonymous
  • anonymous
here \[a=15, b=45\] so the left hand side is \[sin(15+45)=sin(60)\]
anonymous
  • anonymous
\[sin(60)=\frac{\sqrt{3}}{2}\]

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anonymous
  • anonymous
Thanks! What if they are angles such as Use identities (no calculators) to find the exact value for (sin 38)(sin 112) -( cos 38)(cos 112) ???

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