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Secret Identity
The "Sum" of All Fears
That's Not the Half of It!
Going Backwards
Solve This!
100
cos^2 (x) + sin^2 (x)
What is 1?
100
Expansion of cos (15) using sum/difference
What is cos(45)cos(30) + sin(45)sin(30) or cos(60)cos(45) + sin(60)sin(45)?
100
Using half-angle identity and x = 67.5 degrees; exact value of sin(x).
What is √(2+√2) /2
100
sin x = pi/6
What is 1/2?
100
Solution to 3sec(x) = -6
What is 2pi/3 ?
200
2 sin(x) cos(x)
What is sin(2x)?
200
cos (35x) cos (23x)
What is .5[cos(12x) + cos(58x)] ?
200
Exact value of tan(30/2) using half-angle formula.
What is 2 - sqrt(3)?
200
tan^-1(1)
What is pi/4 and 5pi/4 ?
200
√2csc(x) + 3 = 7 on [0, 2pi)
What is .3614, 2.7802
300
1 + tan^2 (x)
What is sec^2 (x)
300
2sin(34x) cos(18x)
What is sin(52x) + sin(16x) ?
300
Exact value of cos(x/2) using fact tan x = -35/12 in Quadrant 2.
What is 5/sqrt (74) ?
300
arcsin (pi)
What is 0?
300
3cos(2x) + 7sin(x) - 5 = 0
What is .7297, 2.4119 and pi/6, 5pi/6
400
(1 + cos(2x))/2
What is cos^2 (x)?
400
Sum to Product form of cos(7x) - cos(3x)
What is -2sin(5x)sin(2x) ?
400
Rewritten form of √((1+cos(30))/2)
What is cos 15 ?
400
arccos[sin(pi/3)]
What is 1/2?
400
csc(x) + cot(x) = 1
What is pi/2 ?
500
True or False? tan(2x) = (2tan(x))/(1+tan(x))
What is False?
500
Exact value of tan(pi/12).
What is [sqrt(3) - 1]/[1+sqrt(3)] OR 2- sqrt(3)?
500
Exact value of sin 11.25 using half-angle identity.
What is √((2-√(2+√2))/2) ?
500
arcsin (-1/2) on [0,360)
What is 210 and 330?
500
4 sin⁡(x)cos⁡(x) - 2√3sin(x) – 2cos(x) + √3 = 0
What is pi/6, 5pi/6, and 11pi/6 ?