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| 1. |
Prove that cos12+sin12/cos12-sin12=tan57(or) cot33 |
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Answer» o −sin12 o
+ cos147 o
sin147 o
= 1+tan12 o
1−tan12 o
+tan147 o
=tan(45 o −12 o )+tan(180 o −33 o )[∵tan(A−B)= 1−tanAtanB tanA−tanB
] =tan33 o −tan33 o [tan(180 o −θ)=−tanθ] =0 ∴ OPTION D is correct |
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