You are watching: Cos(2θ) = cos θ
No, they room not the same.
When you kind $cos^2 heta$ girlfriend actually median $(cos heta)^2$.
When you type $cos heta^2$ you typical $cos( heta ^2)$.
The very first notation is provided to mean$$cos^2 heta = left( cos heta ight)^2$$Your second notation will usually be review as$$cos heta^2 = cos left( heta^2 ight)$$although it is sometimes desired to usage the notation in the right-hand next to be clear.
They space not the very same since$$left( cos heta ight)^2 = cos hetacos heta e cos( heta heta) = cos( heta^2)$$
It"s a matter of syntax.
In handwriting or literature: $sin^2 x equiv (sin x)^2$ and also $cos x^2 equiv cos (x^2)$;
however for computer software, say rwandachamber.orgematica:
Should be very careful.
Thanks for contributing solution to rwandachamber.org Stack Exchange!Please be certain to answer the question. Administer details and also share her research!
But avoid …Asking for help, clarification, or responding to other answers.Making statements based upon opinion; earlier them up with recommendations or personal experience.
Use rwandachamber.orgJax to style equations. rwandachamber.orgJax reference.
See more: Dragon Age Origins Gauntlet Bridge Puzzle Pc, How To Solve The Gauntlet Bridge Puzzle
To learn more, see our advice on writing good answers.
article Your answer Discard
Not the price you're feather for? Browse other questions tagged trigonometry or asking your own question.
Trigonometric identity: $frac an heta1-cot heta+frac cot heta1- an heta =1+sec hetacdotcsc heta$