WITH SOLUTIONS GRADED A+
◉ Opposite 30° in a 30-60-90 triangle. Answer: 1/2
◉ Opposite 60° in a 30-60-90 triangle. Answer: √3/2
◉ Opposite 90° in a 30-60-90 triangle. Answer: 1
◉ Sum Formula for Sine. Answer: sin(A+B) = sinAcosB + cosAsinB
◉ Difference Formula for Sine. Answer: sin(A−B) = sinAcosB −
cosAsinB
◉ Sum Formula for Cosine. Answer: cos(A+B) = cosAcosB − sinAsinB
◉ Difference Formula for Cosine. Answer: cos(A−B) = cosAcosB +
sinAsinB
◉ Sum Formula for Tangent. Answer: tan(A+B) = (tanA + tanB)/(1 −
tanA tanB)