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2.cos = 2.cos = 2.sin
sin + cos - 2 sin + cos + 2.cos =
sin - sin - 2.sin + cos + 2.sin = cos
=
= sin (90°-75°) + cos (180°-75°) - (2•sin(90°-53°)) + cos (90°-30°) + (2•cos (90°-37°))
= cos 75° - cos 75° - (2•cos 53°) + sin 30° + (2•sin 37°)
= 0,922 - 0,922 + 1,837 + 0,5 - 1,287
= 1,05