Question

please solve this issue ​

Answer 1

Answer:

ye bhi sahi hi hona chaiye. agar aur dour ho to mail kar dena [email protected] mujhe bhi aaisae questions banane ko mile ga

plz email par ye book ka name bhej na aur koi question hai oo bhi [email protected]

Answer 2

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We know that identity,

( a + b )² and ( a - b )²

By using this,

( 1 + tan A tan B )² = 1 + 2

tanA.tanB + tan² A. tan² B

( tan A - tan B )². = tan²A - 2 .tanA.tanB+ tanB²

= 1 + tan²A.tan²B + tan²A + tan²B

(2.tanA.tanB was cancelled on both sides)

= 2tan²A + 2tan²B ( after taking out 2 and doing some other steps we get the final answer)

= sec²A + sec²B