Half angles
double angles
simplifying trig identities
sum/dif exact values
More Proofs
100
what is the Formula of X/2 ?
+ or - square root of 1-cos (x) / by 2
100
what is the formula of sin 2x ?
sin 2x equals 2sin x cos x
100
what is (cos x ) (tan x ) ?
sin x
100
what is the formula of cos (x+y) ?
cos (x+y) equals (cos x)(cos y)-(sin x)(sin y)
100
true or false ? 1. sin x = 1 / csc x 2. cos x = sec x + 1 3. tan x = 1 / cot x
1. true 2. false 3. tue
200
If cos(x) equals -4/5 in quad 3 what is sin x/2 ?
sin x/2 equals -3 square root of 10 divided by 10
200
if sin x equals -1/7 in quad 4 what is sin 2x ?
sin 2x equals -8 square root of 3/49
200
what is (sec x squared -1)/(sec squared) ?
sin x squared
200
what is sin 105 degrees equals to ?
sin 105 degrees equals -(square root of 6)+(square root 2)/4
200
true or false ? cos x squared - sin x squared = 2(cos x squared) - 1
true
300
tan 112.5 degrees what is tan x/2 ?
tan x/2 equals (2-square root of 2) /2 square of 2
300
if sin x equals 5/13 in quad 2 what is cos 2x ?
cos 2x equals -120/169
300
what is (sin x /cos x)+(cos x / 1+sin x) ?
2/ cos x (1+sin x )
300
What is cos of 285 degrees equals to ?
square root of 6 - square root of 2 / 4
300
what is sin x squared equals to ?
1 - cos x squared
400
if sin x equals -3/5 in quad 3 what is tan x/2 and cos x/2 ?
tan x/2 equals -3 cos x/2 equals -(square root of 10/10)
400
if cos x equals -12/13 what is tan 2x and cos 2x ?
tan 2x equals -120/119 cos 2x equals 119/169
400
what is cos t + (tan t) (sin t ) ?
sec t
400
What is the formula of tan (x+y) equals to ?
tan x - tan y / 1+(tan x) (tan y)
400
what is tan x squared = ? cot x squared = ?
_ sec x squared - 1 _ csc x squared - 1
500
what are the formulas of tan x/2 ?
tan x/2 equals +-(square root of 1-cos x/1+cos x) equals 1-cos x /sin x equals sin x/1+cos x
500
what is the formula of cos 2x ?
cos 2x equals cos x squared - sin x squared equals 1-2sin x squared equals 2cos x squared -1
500
what is (sec x -cos x)/sin x ?
tan x
500
What is tan (-pie/12) equals to ?
- square root of 3 + 1 /square root of 3 + 1
500
prove that sin x / (sin x +cos x) = tan x / (1+tan x)
you start with the 2nd term and find the 1st term
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