Question

sec? 135
cos (-240) - 2 sin (930')​

Answer 1

Step-by-step explanation:

sin690°cos930°+tan(−765°)csc(−1170°)

=sin(720−30)cos(900+30)+tan(−720+45)csc(3×360+90)

=(−sin30°)(−cos30°)+tan(45°)csc(90°)

=(−

2

1

)(−

2

3

)+(1)(1)

=1+

4

3

=

4

3

+4

.

hope I help you!