Trig ID

cos² x + sin² x

cos²qcos

45

90

60

30

315

360

330

300

210

240

270

225

135

150

180

120

+ sin²q

1
1 – cos² x

sin² x
1 – sin² x

cos² x
1 + tan² x

sec² x
sec² x – 1

tan² x
sec² x – tan² x

1
1 + cot² x

csc² x
csc² x – 1

cot² x
csc² x – cot² x

1
sin 2x

2(sin x)(cos x)
cos 2x

cos² x – sin² x OR 2cos² x – 1 OR 1 – 2sin² x
tan 2x
- 2 tanx
- 1 – tan² x
sin (x + y)

(sin x)(cos y) + (sin y)(cos x)
sin (x – y)

(sin x)(cos y) – (sin y)(cos x)
cos (x + y)

(cos x)(cos y) – (sin x)(sin y)
cos (x – y)

(cos x)(cos y) + (sin x)(sin y)
tan (x + y)
- tan x + tan y
- 1 – tanxtany

Author

roniman

ID

98270

Card Set

Trig ID

Description

trig identities

Updated

9/6/2011, 7:27:53 AM

Show Answers