+71 1. Prove: \(cos^2 x/cotx = sinxcosx\)
2. Prove: (secx cscx) / cotx = sec^2 x
3. Prove: (secx cscx )/ csc^2 x = tanx
4. Prove: (tan^2 x cosx)/ 2secx = 1/2 sin^2 x
5. Prove: \(Tanx/secx = sinx\)
2 -
Verify the following identity:
(sec(x) csc(x))/cot(x) = sec(x)^2
Multiply both sides by cot(x):
csc(x) sec(x) = ^?cot(x) sec(x)^2
Write cotangent as cosine/sine, cosecant as 1/sine and secant as 1/cosine:
1/cos(x) 1/sin(x) = ^?cos(x)/sin(x) (1/cos(x))^2
(cos(x)/sin(x)) (1/cos(x))^2 = 1/(cos(x) sin(x)):
1/(cos(x) sin(x)) = ^?1/(cos(x) sin(x))
The left hand side and right hand side are identical:
(identity has been verified)
3 -
Verify the following identity:
(sec(x) csc(x))/csc(x)^2 = tan(x)
Multiply both sides by csc(x):
sec(x) = ^?csc(x) tan(x)
Write cosecant as 1/sine, secant as 1/cosine and tangent as sine/cosine:
1/cos(x) = ^?1/sin(x) sin(x)/cos(x)
(1/sin(x)) (sin(x)/cos(x)) = 1/cos(x):
1/cos(x) = ^?1/cos(x)
The left hand side and right hand side are identical:
(identity has been verified)
