Thread: Proving identities

hello, i am having problems with my homework, theres five problems i can not figure out, any help would be great,

1) cot x * sec x * sin x = 1


2) 2sec^2 y =1/(1 - sin y) + 1/(1 + sin y)


3) sec^2 a + csc^2 a = sec^2 a * csc^2 a


4) sin^4 β - cos^4 β = 1 - 2cos^2 β

5) cos Φ/(1 + sinΦ) + (1 + sin Φ)/cos Φ = 2sec Φ


HELP PLEASEE!!!!!!!!!!!

Originally Posted by jpenny32

hello, i am having problems with my homework, theres five problems i can not figure out, any help would be great,

1) cot x * sec x * sin x = 1


2) 2sec^2 y =1/(1 - sin y) + 1/(1 + sin y)


3) sec^2 a + csc^2 a = sec^2 a * csc^2 a


4) sin^4 β - cos^4 β = 1 - 2cos^2 β

5) cos Φ/(1 + sinΦ) + (1 + sin Φ)/cos Φ = 2sec Φ


HELP PLEASEE!!!!!!!!!!!

1)

2)


3)
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Similarly, try using trigonometric identities on the other 2 questions.