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Find the value of ` (sin25^(@))/(cos35^(@))-(cos25^(@))/(sin35^(@))`

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Find the value of ` (sin25^(@))/(cos35^(@))-(cos25^(@))/(sin35^(@))`
A. `"cosec"70^(@)`
B. `sin70^(@)`
C. `-sin 70^(@)`
D. `-"cosec"70^(@)`
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Correct Answer - D
(i) Use `cos A cos B- sin A sinB=cos(A+B) and sin2A=2sinA cosA`.
(ii) Find the LCM of denominators and simplify.
(iii) Use the formula `cos(A+B)=cosA cos B- sinA sin B. `
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