evaluate :sin60degreecos30degree+sin30degreecosdegree
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sin 60° ×cos 30° + sin 30° × cos 60°
=> sin 60° × cos (90-60)° + sin (90-60)° × cos 60°
=> sin 60° × sin 60° + cos 60° × cos 60°
=> (sin60°)^2 + (cos60°)^2
=> 1
=> sin 60° × cos (90-60)° + sin (90-60)° × cos 60°
=> sin 60° × sin 60° + cos 60° × cos 60°
=> (sin60°)^2 + (cos60°)^2
=> 1
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