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Trigonometry help. I cant do this

Trigonometry help. I cant do this
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3 votes
Trigonometry help. I cant do this

Trigonometry help. I cant do this-example-1
User Martin Kleiven
by
7.6k points

2 Answers

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

User Alexandre Voyer
by
7.6k points
6 votes
cos75 = 0.258819045 = sin15
User Vibha Sanskrityayan
by
7.8k points
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