given that cosA+cos^2A=1
prove that
sin^12A+3sin^10A+3sin^8A+sin^6A+2sin^4A+2sin^2A-2=1
2007-06-07 23:34:35 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
who says : cosA+cos^2A=1
and why did you believe it.
I can say cosA+cos^2A= 0 or
cosA+cos^2A=100000000000000000
Dont believe anyone until and unless he proves it.
Anyways.. ask the bugger who asked you such stupid question.
Have some Chill Pill
2007-06-07 23:38:37 · answer #1 · answered by Rahul 2 · 0⤊ 0⤋
CosA + Cos^2A doesn't equal 1.
However, cos^2A + sin^2A does equal 1
2007-06-07 23:45:36 · answer #2 · answered by รզlεսռց ☆ 6 · 0⤊ 0⤋
I can tell you how to do it.
Remember that
sin^12A = (sin^2A)^6
for sin^2A substitute (1 - cos^A) because sin^2A+cos^2A = 1
then look for cosA+cos^2A and substitute 1 for that.
This should give you the answer
(U may use other trigonometric ids)
2007-06-08 00:10:40 · answer #3 · answered by blind_chameleon 5 · 0⤊ 0⤋