Trig identities Flashcards by mariella hardisty

Q

1+cot^2(x)=?

A

1+cot^2(x)=cosec^2(x)

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Q

1+tan^2(x)=?

A

1+tan^2(x)=sec^2(x)

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Q

cos2x=?

A

=cos²x- sin²x
=2cos²x-1
1-2sin²x

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Q

sin2x=?

A

= 2sinxcosx

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Q

tan2x= ?

A

2tanx/(1-tan²x)

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