8 Evaluate the Silawing withou zgcinia ttegymetnoi tan 315 k

8. Evaluate the Silawing withou zgcinia t,tegy-met-noi tan 315\" (k)see (=480) (c) sina(10) + eor\'(10)

Solution

since the question id not visible properly, what i interorete the question i made the solution

(a)tan(315degree)=tan(360degree-45degree)=-tan(45degree)= -1

(b)sec(-480degree)=sec(480degree)=sec(360degree+120degree)=sec(120degree)=sec(180degree-60degree)=-sec(60degree)=-2

(c)sin(7pi/2)=sin(4pi-pi/2)=-sin(pi/2)=-1

(d)sin^2(10degree)+cos^2(10degree)=1 [ since sin^2x+cos^2x=1]