Studied by 18 people

5.0(2)

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Hint

Pythagorean Identities, Sum and Difference Identities, Double Angle Identities

1

cos^2 x + sin^2 x=

1

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2

1 - sin^2 x=

cos^2 x

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3

( 1- sin x)(1+ sin x)

cos^2 x

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4

1 - cos^2 x=

sin ^2 x

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5

(1- cos x)(1+cos x)

sin^2 x

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6

1 + tan^2 x=

sec^2 x

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7

sec^2 x- tan^2 x=

1

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8

(sec x - tan x)(sec x + tan x)=

1

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9

tan^2 x-sec^2 x=

-1

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10

(tan x- sec x)(tan x + sec x)=

-1

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11

1 + cot^2 x =

csc^2 x

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12

csc^2 x - cot^2 x=

1

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13

(Csc x - cot x)(csc x+ cot x)=

1

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14

cot^2 x - csc^2 x=

-1

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15

(cot x- csc x)(cot x+csc x)=

-1

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16

sin(A+B)=

(sin A)(cos B) + (sin B)(cos A)

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17

sin(A-B)

(sin A)(cosB)-(Sin B)(Cos A)

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18

cos(A+B)

(cos A)(cos B)- (sinA)(sinB)

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19

cos(A-B)

(cos A)(cos B) + (sin A)(Sin B)

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20

tan(A-B)

tan A - tan B/1+ (tan A)(tan B)t

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21

tan(A+B)

tan A + tan B/ 1-(tan A)(tan B)

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22

sin(2x)

2(sin x)(cos x)

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23

cos(2x)

cos^2 x- sin^2 x

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24

cos(2x)

2 cos^2 x-1

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25

cos(2x)

1-2(sin^2 x)

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26

tan(2x)

2(tan x)/1-tan^2 x

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