Answer:
Step-by-step explanation:
Using the diagram, we can see that the angle is a right angle.
With this information, we can set up an equation:
Please note that right angles are always equivalent to 90 degrees.
Add like terms:
Subtract 82 from both sides:
Divide both sides by 8
Answer:
3
Step-by-step explanation:
5-8/2+6/4+4*2+3^2
5-4+6/4+8+9
11-4/21
7/21
3
#ans
Not sure what you mean by "using diagonals", but I'll take a guess and say it refers to the trick where you copy the matrix like this,
Then the determinant is computed by taking the leftmost three left-to-right diagonals, multiplying elements on the same diagonal together, then adding the three products together:
Next, take the rightmost right-to-left diagonals, doing the same as before:
The determinant is then the difference of these two, so the answer would be 16 (A).
Answer:
see explanation
Step-by-step explanation:
Using the Pythagorean identity
sin²α + cos²α = 1 ( divide each term by sin²α )
+ = , that is
1 + cot²α = cosec²α ← as required