Which of the following is an identity? sinBsecBcotB = 1 sinBsecBcotB = cotB sinBsecBcotB = sin²B/cos²B?
Solve for x, 0</x</360
cos^ 2x + cos^2x = 1
35
145
215
325
x = -135, cos 2x = 1 - 2 sin^2x
True
False
x=60, Tan x/2 = (1-cosx)/(sin^2xsinx) true false
1/sin^2x=4
30
150
210
330
2 sin x - sqrt 3 = 0
pi/3
2pi/3
4pi/3
5pi/3
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none of the 1st are valid...45 , 135 , 225 , 315 ; always true ; true ; all ; π / 3 & 2π / 3
and initial...= 1