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If p=tan20^@ express (tan160^@-tan110^@)...

If `p=tan20^@` express `(tan160^@-tan110^@)/(1+tan160^@.tan110^@)` in terms of p.

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The correct Answer is:
`(1-p^2)/(2p)`
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If tan20=lambda ,prove that (tan160^(@)-tan110^(@))/(1+tan160^(@)*tan110^(@))=(1-lambda^(2))/(2 lambda) .

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If : p = cot 20^(@),"then": (tan 160^(@) - tan 110^(@))/(1 +tan 160^(@) * tan 110^(@))= A) (p^(2)-1)/(2p) B) (p^(2)+1)/(2p) C) (1-p^(2))/(2p) D) (2p)/(1 + p^(2))

MARVEL PUBLICATION-TRIGONOMETRIC FUNCTIONS OF COMPOUND ANGLES AND FACTORIZATION FORMULAE-MCQs
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  10. For any angles A and B, sin(A+B). sin(A-B)=......

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  11. For any angles A and B, cos(A+B).cos(A-B)=…..

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