Question

Plz answer question no 13,14,18&19.
Any wrong answer like:u can find on google etc. Will b reported.

Answer 1

ques 14 solution

firstly convert cos ^A into sin^ A then calculate the value of A it comes out to be as 7 pie/6 now substitute in tan A as tan 7 pie / 6

ans comes out to be as 1/root 3.

ques 19 solution

write sin ^ 25 as cos ^ (90-65) and tan 5 as cot (90-85) and tan 15 as cot (90-75) and solve it and answer will be as 2 .

ques 18 solution
square both the equations and then just add the both equations .

ques 13 solution
as A+B = 90 then B = 90- A
so then just substitute B as 90-A in the L.H.S
Answer will be left as root tan ^2A when u solve it .
then just it will come as tan A .
R.H.S
Hence proved.