Prove that tan^2a + cot^2a = 1 is not a trigonometric identity by producing a counterexample

Proof is given below.

Step-by-step explanation:

To prove: is not a trigonometric identity.

A trigonometric identity is an equation whose left hand side is always to the right hand side for any value of the given angle.

A counterexample is a method used to counter the given statement by taking a random value for the given quantity and disproving the left and right side of the equation.

So, let us take A = 45°

Then, left hand side of the equation becomes;

Therefore, the value of left hand side of the equation on plugging in 45° for A gives the result as 2.

But the right hand side of the equation is equal to 1.

Therefore,

So, this violates the given equation and hence the given equation is not always true. So, it's not a trigonometric identity.

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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