Question

Help plzzzzzzzzzzzzzzzzz

Answer 1

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,

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

Answer 2

Answer:

this answer is -1.8

Step-by-step explanation:

because you add and subtract all of them