Optional Mathematics X LSA

CosBSinA + CosASinB

SinBCosA + CosBSinA

CosACosB - SinASinB

None of these

CosACosB + SinASinB

—CosACosB + SinASinB

CosACosB - SinASinB

SinACosB - CosASinB

$\frac{\cot A\cot B-1}{\cot A+\cot B}$

$\frac{\cot A\cot B+1}{\cot A-\cot B}$

$\frac{\cot A\cot B-1}{\cot B-\cot A}$

NONE OF THESE

$\cos^27x$

$2\cos^27x$

$2\sin^214x$

$\sin^23x$

 $4\sin^3\theta-3\sin\theta$  

 $3\sin\theta+4\sin^3\theta$  

 $3\sin\theta-4\sin^3\theta$  

 $4\sin^3\theta+3\sin\theta$  

 $4\cos^3\theta+3\sin\theta$  

 $4\cos^3\theta-3\cos\theta$  

 $3\cos\theta-4\cos^3\theta$  

 $3\cos^3\theta-4\cos\theta$  

 $\sec\theta$  

 $\operatorname{cosec}\theta$  

 $-\sec\theta$  

 $-\operatorname{cosec}\theta$  

 $\frac{2\tan\alpha}{1-\tan^2\alpha}$  

 $\frac{2\tan\alpha}{1+\tan^2\alpha}$  

 $\frac{1+\tan^2\alpha}{1-\tan^2\alpha}$  

 $\frac{1-\tan^2\alpha}{1+\tan^2\alpha}$  

 $\cot\theta$  

 $\tan\theta$  

 $\sin\theta$  

 $\cos\theta$  

-0.707

-0.866

0.866

-0.5