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Trigonometry help. I cant do this
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Trigonometry help. I cant do this
asked
Sep 9, 2018
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Trigonometry help. I cant do this
Mathematics
high-school
Martin Kleiven
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Martin Kleiven
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2
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3
votes
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
Alexandre Voyer
answered
Sep 12, 2018
by
Alexandre Voyer
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6
votes
cos75 = 0.258819045 = sin15
Vibha Sanskrityayan
answered
Sep 15, 2018
by
Vibha Sanskrityayan
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