Question

solve it friends............... ​ any two

Answer 1

Step-by-step explanation:

tan^2a+2+cot^2a

= (1+tan^2a)+(1+cot^2a)

=(sec^2a)+(cosec^2a)

= (1/cos^2a)+(1/sin^2a)

= (sin^2a+cos^2a)/(sin^2a*cos^2a)

= 1/sin^2a*cos^2a

= cosec^2a *sec^2a

3)

2sin^2A+cos^4A

= 2(1-cos^2A)+cos^4A

=2-2cos^2A+cos^4A

= (cos^4A-2cos^2A+1)+1

= (1-cos^2A)^2+1

= (sin^2A)^2+1

=sin^4A+1

hence proved