18. Which of the following is a Pythagorean relation? a. cos²0-sin²01 b. 1+ sec20 tan²0 19. From one end of a 6-km straight road, a helicopter is seen hovering directl su" bind the c. 1+ cote csc²0 d. sec²0-tan²0=csc²0- cot²0

Q: 4. 110 m 48° X

A: Solution:

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Q: Q/// irrational numbers is connected or disconnected in R

A: To Check : Set of irrational numbers is connected or disconnected in R

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A: We can find the value of x and y for both the questions.

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A: Solve the following

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A: As we know that if  tanθ=tanα  then θ=nπ+α see below the answer and explanation

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Q: 22. If cose (a) osẻ = — and ✔ is in quadrant IV, then cos (b) (c) ²/ 213 L23 √ (d) (e) ± 27/1

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A: We can find the 2nd term as below

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A: