Asked by mercy

given that sin (90-5 t ta )=cos180 - t ta...find d value of t ta
Answered by Reiny
What is "t ta" ??
Where does "d" enter the picture?
Answered by Reiny
I will assume that by t ta you mean Ø

so sin(90 - 5Ø) = cos(180 - Ø)
but sin(90 - 5Ø) = cos Ø
just like sin(90 - 30) = cos30

so we have
cos(5Ø) = cos(180-Ø)
take arccos of both sides
5Ø = 180-Ø
6Ø = 180
Ø = 30
Answered by Writeacher
Ø is the math symbol called "theta"

It comes from the 8th letter in the Greek alphabet:
http://www.omniglot.com/images/writing/classical_attic.gif
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