`cot(45^@+theta)cot(45^@-theta)=`

If costheta=8/17 and theta lies in the 1^(st) quadrant, then the value of cos(30^@+theta)+cos(45^@-theta)+cos(120^@-theta) is

(cos(90^@+theta)sec(-theta)tan(180^@-theta))/(sin(360^@+theta)sec(180^@+theta)cot(90^@-theta))=

If (-pi)/2<(theta)<(pi/2) and theta!=+-pi/4 , then the value of cot(pi/4+theta)cot(pi/4-theta) is

cot(pi/4+theta)cot(pi/4-theta)"is" .................. A) 0 B) -1 C) 1 D) -2

If theta lies in the first quardrant and costheta=(8)/( 17 ) , then find the value of cos(30^(@)+theta)+cos(45^(@)-theta)+cos(120^(@)-theta) .

Prove that (cos(90^(@)+theta)sec(-theta)tan(180^(@)-theta))/(sec(360^(@)-theta)sin(180^(@)+theta)cot(90^(@)-theta))=-1

Prove the following identities: (frac(tan^3theta)(1+tan^2theta))+(frac(cot^3theta)(1+cot^2theta))=secthetacosectheta-2sinthetacostheta

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