Answer:

Step-by-step explanation:

sin 60°  = √3/2

cos 30°  = √3/2

sin 30°  = 1/2

cos 60°  = 1/2

(.) means multiply

sin 60° x cos 30°  +  sin 30° x  cos 60°

(√3/2  x  √3/2) + (1/2 x  1/2)

(√3/2)² + (1/2) ²

3/4 + 1/4

4/4

= 1

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