Answer:
x=17
Step-by-step explanation:
Sin and cos are complementary angles, they both add. up to form 90 degrees.

where x+y=90




You use Sarrus rule, and perform the following multiplications of diagonal items:
diagonals from left to right (using wrap around)
+14*8*5
+-13*-1*-10
+0*3*-2
diagonals from right to left are subtracted
-0*8*-10
--13*3*5
-14*-1*-2
is 560-130+0 - 0+195-28 = 597
A star is written to show multiplication. It is a replacement for a dot or a x which is what you probably learned to be the "times" sign. In upper level maths, the "x" is replaced with a " * " to make it more legible and to avoid confusion with the variable "x".
Answer:
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Option B is the correct option.
Step-by-step explanation:

Apply cross product property
⇒
Distribute 5 through the parentheses
⇒
Multiply the numbers
⇒
Move 5 to right hand side and change it's sign
⇒
Add the numbers
⇒
Divide both sides of the equation by 5
⇒
⇒
Hope I helped!
Best regards!!