music700
music700
14-11-2017
Mathematics
contestada
Trigonometry help. I cant do this
Respuesta :
dragonslasher
dragonslasher
14-11-2017
the answer is 0.921.
Apply the trig identity: cos (a + b) = cos a.cos b - sin a.sin b
cos
(75)
=
cos
(30+45)
=
cos30
⋅
cos45
−
sin30
⋅
sin45
=
0.921
Answer Link
musiclover10045
musiclover10045
14-11-2017
cos75 = 0.258819045 = sin15
Answer Link
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