when two people answer a question, at the bottom of the question you asked you can see a button that says "mark as brainliest"
then click that button, and there you have it! hope this !
triple angle formulas are these:
each of the six trig functions is equal to its co-function evaluated at the complementary angle. periodicity of trig functions. sine, cosine, secant, and cosecant have period 2π while tangent and cotangent have period π. identities for negative angles.
answer a is better.
in the expression 3*x/5 * and / have the same priority ==> we read from left to right ==> (3x)/5 the quotient of 3x and 5.