1.

3sin²A - 2sinA - 5. ​

Answer»

Step-by-step EXPLANATION:

this is in quadratic EQUATION in term of sinA

if sinA=x then

3x^2-2x-5=0

FORMULA for quadratic equation is -b+-sqrt(b^2-4ac)/2a

2+-sqrt(4-4(3)(-5)/2×3

2+-sqrt(4+60)/6

2+-8/6

2+8/6 and 2-8/6

5/3 and -1



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