Question

Find the exact value of each expression without a calc.?

cos(-π/6)sin(-π/4)-tanπ/4

Answer 1

cos(-π/6)=-sqrt3/2
sin(-π/4)=-sqrt2/2

Answer 2

-1

Answer 3

cos (-x)=cos(x)
cos(pi/6)=sqrt3/2
sin(pi/4)=sqrt2/2
tan(pi/4)=1
now solve

Answer 4

So i get the sol for the 3 equations separately and that's just my answer? Why are the eq stuck together then?

Answer 5

multiply them

Answer 6

hold on

Answer 7

sqrt 6/2?

Answer 8

so the answer is sqrt3/2 * (-sqrt2/2) -1

Answer 9

sqrt6 - 2/2?

Answer 10

that should be your answer!

Answer 11

Awesome, great thanks :)

Answer 12

yeah

Answer 13

good