Question

Sin (-1230°)-cos{(2n+1)π+π\4}

Answer 1

Answer:

We'll assume integer

n

and the first argument is degrees; the second radians. That's a lot of assumptions to do this silly problem.

sin

(

−

1230

∘

)

−

cos

(

(

2

n

+

1

)

π

+

π

3

)

=

sin

(

−

1230

∘

+

3

×

360

∘

)

−

cos

(

2

π

n

+

4

π

3

)

=

sin

(

−

150

∘

)

−

cos

(

4

π

3

)

=

−

sin

150

∘

−

cos

240

∘

=

−

sin

30

∘

−

cos

120

∘

=

−

sin

30

∘

+

cos

60

∘

=

−

sin

30

∘

+

sin

30

∘

=

0