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1/2√2x1
1/2√2
cos 60 = ¹/₂
sin 30 = ¹/²
sin 60 = ¹/₂ √3
cos 90 = 0
tan 60 = √3
a) sin 45 x (cos 60 + sin 30) = ¹/₂ √2 ( ¹/₂ + ¹/₂) = ¹/₂ √2 (1)= ¹/₂√2
b) (cos 30 + cos 60) x tan 60 = (¹/₂√3 +¹/₂) √3 = ³/₂ + ¹/₂√3
c) sin 45 x cos 45 - sin 30 x cos 60 + cos 90 =
= (¹/₂√2 x ¹/₂√2) - (¹/₂ x ¹/₂) + 0
= ¹/₂ - ¹/₄ + 0
= - ¹/₂