Răspuns :

Răspuns:

cos60°• sin60° + sin90° - sin30° • cos30° = 1

cos60° = 1/2

sin60° = √3/2

sin90° = 1

sin30° = 1/2

cos30° = √3/2

cos60°• sin60° + sin90° - sin30° • cos30°  =

1/2 · √3/2  + 1 - 1/2 · √3/2 = √3/4 + 1 - √3/4 = 1

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