CBSE Class 10 Answered
sin A + cos B A 30° B is an acute angle find the value of B
![question image](http://images.topperlearning.com/topper/new-ate/top_mob1608822888593415401d8c35cc7-29d0-471f-8b54-33bf4fc651f5.jpg)
Asked by rusuishika | 24 Dec, 2020, 20:44: PM
sin A + cos B = 1
As A = 30°
Sin 30° = 1/2
![1 half](https://images.topperlearning.com/topper/tinymce/cache/41891f5e8ace60c819a1c76af3792a55.png)
Cos B = 1-![1 half](https://images.topperlearning.com/topper/tinymce/cache/41891f5e8ace60c819a1c76af3792a55.png)
![1 half](https://images.topperlearning.com/topper/tinymce/cache/41891f5e8ace60c819a1c76af3792a55.png)
Cos B = ![1 half](https://images.topperlearning.com/topper/tinymce/cache/41891f5e8ace60c819a1c76af3792a55.png)
![1 half](https://images.topperlearning.com/topper/tinymce/cache/41891f5e8ace60c819a1c76af3792a55.png)
This will happen when B = 60°
Answered by | 26 Dec, 2020, 00:30: AM
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