Question

8. यदि sin alpha = 1/2
और alpha एक न्यूनकोण है, तब
(3 cos alpha -4 cos alpha ) का मान ज्ञात कीजिए।​

Answer 1

Answer:

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Answer 2

GIVEN ,

$\sin( \alpha ) = \frac{1}{2}$. ____(1)

AS WE KNOW THAT,

sin30⁰ = 1/2________(2)

From 1 and 2

sin\alpha = sin30⁰

=> \alpha = 30⁰

So,

cos\alpha = cos30⁰ = √3/2

So,. 3cos\alpha - 4 cos\alpha

= 3 . √3/2 - 4 . √3/2

= - √3/2 ✓