Question

-11sin42/(cos21*cos69) ​

Answer 1

-11sin(42°)/cos(21°)cos(69°) = -11sin(42°)/cos(21°)cos(90°-21°) = -11sin(42°)/cos(21°)sin(21°) = -11sin(42°)/0.5sin(42°) = -22

Answer 2

To evaluate the expression -11sin42/(cos21*cos69), we need to use trigonometric functions. However, keep in mind that trigonometric functions typically work with angles measured in degrees, not radians. If your calculator is set to radians, you may need to convert the angles from degrees to radians before proceeding.

Using degrees, we have:

sin(42) ≈ 0.6691 cos(21) ≈ 0.9272 cos(69) ≈ 0.3420

Plugging these values into the expression, we get:

-11 * 0.6691 / (0.9272 * 0.3420)

Calculating further:

= -7.3601 / 0.3174

≈ -23.1512

Therefore, -11sin42/(cos21*cos69) is approximately equal to -23.1512.