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kirill [66]
3 years ago
5

Help plzzzzzzzzzzzzzzzzz

Mathematics
2 answers:
Rudik [331]3 years ago
7 0

Answer:

0.9

Step-by-step explanation:

Basic angle =

cos { }^{ - 1} ( \frac{4}{5} ) = 36.870 \: degrees \\

Therefore,

theta = 180 + 36.870 = 216.87 \: degrees

Therefore,

\sin( \frac{theta}{2} )  =  \sin(108.435 )  = 0.9

alekssr [168]3 years ago
6 0

Answer:

this answer is -1.8

Step-by-step explanation:

because you add and subtract all of them

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