what is the value of 2sin10
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Answer:
VALUE OF 2 SIN 10
Step-by-step explanation:
Given expression is 1−4sin10∘sin70∘2sin10∘1−4sin10∘sin70∘2sin10∘
⇒1−2[cos60∘−cos80∘]2sin10∘⇒1−2[cos60∘−cos80∘]2sin10∘
⇒1−2[12−cos80∘]2sin10∘⇒1−2[12−cos80∘]2sin10∘
⇒2cos80∘2sin10∘⇒2cos80∘2sin10∘
⇒cos(90∘−10∘)sin10∘⇒cos(90∘−10∘)sin10∘
⇒sin10∘sin10∘⇒sin10∘sin10
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Answered by
2
Given expression is 1−4sin10∘sin70∘2sin10∘1−4sin10∘sin70∘2sin10∘
⇒1−2[cos60∘−cos80∘]2sin10∘⇒1−2[cos60∘−cos80∘]2sin10∘
⇒1−2[12−cos80∘]2sin10∘⇒1−2[12−cos80∘]2sin10∘
⇒2cos80∘2sin10∘⇒2cos80∘2sin10∘
⇒cos(90∘−10∘)sin10∘⇒cos(90∘−10∘)sin10∘
⇒sin10∘sin10∘⇒sin10∘sin10∘
⇒1
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