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Q1. (1 - tan2 45o)/(1+tan2 45o) is equal to:

(a) tan 90o

(b) 1

(c) sin 45o

(d) 0

Q2. (2 tan 30o)/(1 + tan2 30o) is equal to:

Q3. cos 48o - sin 42o is :

Q4. cos A is the abbreviation used for the:

Q5. If `Theta` is an acute angle such that sec2 `theta` = 3, then the value of (tan2 `theta` - cosec2  `Theta` )/(tan2  `theta` + cosec2 `theta` ) is

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