Evaluate cos(80)cos(70)+sin(80)sin(70)

Math
cos(80)cos(70)+sin(80)sin(70)
Simplify each term.
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Evaluate cos(80).
0.17364817cos(70)+sin(80)sin(70)
Evaluate cos(70).
0.17364817⋅0.34202014+sin(80)sin(70)
Multiply 0.17364817 by 0.34202014.
0.05939117+sin(80)sin(70)
Evaluate sin(80).
0.05939117+0.98480775sin(70)
Evaluate sin(70).
0.05939117+0.98480775⋅0.93969262
Multiply 0.98480775 by 0.93969262.
0.05939117+0.92541657
0.05939117+0.92541657
Add 0.05939117 and 0.92541657.
0.98480775
Evaluate cos(80)cos(70)+sin(80)sin(70)

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