Question

11.Evaluate sin 765 + cosec (-1125) + sec ( -780)
​

Answer 1

Answer:

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

.

Step-by-step explanation:

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