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