Prove that: 2tan50° +tan20° = cot20°
Answer:

Trigonometric Ratios of Compound Angles | Trigonometry | SciPiPupil

I  call this question neither as tricky nor as hard but serious. Because you need to be serious on every of your steps in this question!
We knew that, cot20°= tan70°

So, the first thing we did is find the common relation between the LHS and the RHS. Since we got the relation, 50°+20°=70°, these are the given angles that we need to prove equal and also we got tan on both sides which makes us easy to solve!

Then, we apply the formula and solve. And what we also need to remember is tanx .cotx =1

So, you need to be aware on every steps to be able to solve this question!
Have a look at these formulas of Trigonometric Ratios for Compound Angles.


Therefore, you solve the question of compound angles I'm the above mentioned way in Trigonometry of Mathematics.

Question: Prove that: 2tan50° +tan20° = cot20° | Trigonometric Ratios of Compound Angles | Trigonometry | SciPiPupil

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