CoFunctionsSuch examinations, lead us to three sets of "cofunction" identities:Also written:Notice the connection of the letters C & O: * sine and cosine cofunctions * tangent and cotangent cofunctions * secant and cosecant cofunctions * complementaryExamples:1. Find a Value of θ for which sin θ = cos 15º is true Solution: Since sine and … [Read more...] about CoFunctions