Question

Find the value of cos2A+2cos^A-2cos2A.cosA/sin2A-2sin^Asin2A
Options
1.tanA.
2.cotA
3.cot2A

Answer 1

Your answer is cot2A

Answer 2

all options are wrong here bcz if here we put a=30 then it will be come as

cos60+2cos²30-2cos60cos30/sin60-2sin²30sin60

=1/2+2*3/4-2*1/2*√3/2/√3/2-2*1/4*√3/2

=1/2+3/2-√3/2/√3/2-√3/4=2-√3/2/√3/4

now we get final this value now if if we put 30 in all above option it won't satisfy the value that we get after solving this

so in my opinion all options are wrong here