1.

Sin^4 theeta - tan^4 theeta = sec^2 theeta + tan^ theeta ( PROVE THIS)

Answer»

ANSWER:

{ \sec^{4} θ } - tan^4 θ = sec^2θ + tan^2θ

proof..

lhs = Sec^4θ - tan^4 θ

= ( { \sec}^{2} θ + { \tan}^{2} θ)( { \sec}^{2} θ - { \tan}^{2} θ)

= ( { \sec }^{2} θ + { \tan }^{2} θ)

hence \: proved.


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