1.

Find the value of:(1+cot^2) (1+cos) (1-cos)

Answer»

Answer:(1 + cot2∅)(1 - cos∅)(1 + cos∅) = 1

{USE , (a + B)(a - b) = a² - b² }

(1 + cot2∅)( 1 - cos²∅) = 1

[ use, 1 - cos²x = sin²x]

(1 + cot2∅)(sin²∅) = 1

( 1 + tan2∅)(sin²∅) = tan2∅

use, FORMULA,

tan2∅ = 2tan∅/(1 - tan²∅)

( 1 - tan²∅ +2tan∅)sin²∅/(1 - tan²∅) = 2tan∅/( 1 - tan²∅)

(1 -tan²∅+ 2tan∅)sin²∅ = 2tan∅

( 1 - tan²∅+2tan∅)/cosec²∅ = 2tan∅

( 1 - tan²∅ + 2tan∅)/(1 + cot²∅) = 2tan∅

( 1 - tan²∅ + 2tan∅)tan∅/(1 +tan²∅) = 2

tan∅ - tan³∅ +2tan²∅ = 2 + 2 tan²∅

tan³∅ - tan∅ +2 = 0

Read more on Brainly.in - brainly.in/question/1270767#readmore

Step-by-step explanation:



Discussion

No Comment Found

Related InterviewSolutions