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OpenStudy (anonymous):
Evaluate the expression using an appropriate double angle formula. 1/sin(105)cos(105) help!!
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jimthompson5910 (jim_thompson5910):
using the formula found on this page http://www.sosmath.com/trig/Trig5/trig5/trig5.html
jimthompson5910 (jim_thompson5910):
look under "double angle formulas"
jimthompson5910 (jim_thompson5910):
we see that sin(2u) = 2sin(u)cos(u) which means that sin(2u) = 2sin(u)cos(u) (1/2)*sin(2u) = sin(u)cos(u) sin(u)cos(u) = (1/2)*sin(2u)
jimthompson5910 (jim_thompson5910):
Let me know if this is enough to get started
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