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[" 18."tan^(2)theta-sin^(2)theta=tan^(2)...

[" 18."tan^(2)theta-sin^(2)theta=tan^(2)theta*sin^(2)theta],[" 19."tan^(2)theta+cot^(2)theta+2=sec^(2)theta*cosec^(2)theta]

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Prove that tan^(2)theta+cot^(2)theta+2=sec^(2)theta cosec^(2)theta

Prove: tan^(2)theta+cot^(2)theta+2=sec^(2)theta.cosec^(2)theta .

Prove that (i) sec^(2) theta + "cosec"^(2) theta = sec^(2) theta "cosec"^(2) theta (ii) tan^(2) theta - sin^(2)theta = tan^(2)theta sin^(2)theta (iii) tan^(2) theta + cot^(2)theta +2 = sec^(2) theta "cosec"^(2) theta

prove that tan^(2)theta+cot^(2)theta=sec^(2)theta+cosec^(2)theta-2

prove that: tan^(2) theta-cot^(2) theta=sec^(2) theta- cosec^(2) theta

(sec^(2)theta-sin^(2)theta)/(tan^(2)theta)=cosec^(2)theta-cos^(2)theta

Prove : cot^(2) theta-tan^(2)theta=cosec^(2)theta-sec^(2)theta

Prove: cot^(2)theta- tan^(2) theta=cosec^(2)theta-sec^(2)theta .

Prove : cot^(2) theta-tan^(2)theta=cosec^(2)theta-sec^(2)theta

"cosec"^(2) theta * cot^(2) theta -sec^(2) theta * tan^(2) theta - (cot^(2) theta - tan^(2) theta ) (sec^(2) theta * "cosec"^(2) theta -1)=