Please solve question 4th it's very urgent
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Answer: k= 1
Step-by-step explanation:
Here I have used identity (1+sinx)(1-sinx) = 1-sin²x = cos²x
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★Heya★
let theta = x
k = Sec² x ( 1² - Sin² x )
Becoz ( a - b ) × ( a + b ) = a² - b²
=>
k =( Sec² x ) × ( Cos² x )
Becoz ( 1 - Sin² x ) = Cos² x
=>
k = (Sec² x ) × ( 1/ Sec² x )
Becoz Cos² x = 1/Sec² x
=>
k = 1
☺️☺️
let theta = x
k = Sec² x ( 1² - Sin² x )
Becoz ( a - b ) × ( a + b ) = a² - b²
=>
k =( Sec² x ) × ( Cos² x )
Becoz ( 1 - Sin² x ) = Cos² x
=>
k = (Sec² x ) × ( 1/ Sec² x )
Becoz Cos² x = 1/Sec² x
=>
k = 1
☺️☺️
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