Question

PLZZZ HELP ME .........
If u know any of these questions then plzz answer it bcz i have me ppr tomorrow....

Answer 1

hii broo

let me explain you the answer

STEP 01

TAKE THE LHS

STEP 2

SUBSTITUTE THE EQUATIONS


cosx+ cosy = 2 cos((x + y )div by 2)cos((x - y )div by 2)


sinx-siny = 2cos((x+y)div by 2)sin((x - y )div by2)


RESPECTIVELY

STEP 3

TAKE THE SQUARE OF THE BOTH TEAMS WITHOUT TAKING OUT THE MAIN SQUARE ROOT

STEP 4

TAKE

[4cos^2((x+y)div by 2)

COMMON FROM BOTH THE TERMS

STEP 5

REARRANGE THE TERMS INSIDE THE BRACKET

STEP 6

USE THE EQUATION
_________________
[sin^2 (x)+cos^2(x) = 1]
_________________

STEP 7

TAKE OUT THE SQUARE ROOT


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