Refer to the unit circle and you can answer this yourself.rocophysics said:cos(90+theta) = sin(theta)
sin(90+theta) = -cos(theta)
thanks!
lol ah! why didn't it click, thanks again cristo :-]cristo said:No, they are not. Do you know an expression for cos(x+90) and sin(x+90), or more generally cos(a+b) and sin(a+b)?
Trigonometric identities are mathematical equations that involve trigonometric functions such as sine, cosine, and tangent. They are used to simplify and solve trigonometric equations and expressions.
To verify the correctness of a trigonometric identity, you can use algebraic manipulation to show that both sides of the equation are equal. You can also use a calculator to plug in values for the variables and see if both sides of the equation give the same result.
Yes, trig identities can be used to simplify and solve trigonometric equations. They can also be used to prove other trigonometric identities.
Yes, there are several steps you can follow when using trig identities. First, identify the type of identity you are dealing with (e.g. Pythagorean, sum and difference, double angle). Then, use algebraic manipulation and substitution to simplify the equation. Finally, check your solution by plugging in values for the variables or using a calculator.
Yes, you can create your own trigonometric identities by using algebraic manipulations and substitutions on existing identities. However, it is important to verify the correctness of your new identity before using it in any calculations.