Question

cos70 degree by sin 20 degree + cos 55 degree .cosec35/tan5.tan65.tan85=1​

Answer 1

Answer:https://brainly.in/question/8715959#

Step-by-step explanation:

(Cos70 / sin20 )+ ((cos55 cosec35 )/ (tan5 tan25 tan45 tan65 tan85))

=(cos(90-20) /sin20)+(cos55 cosec35)/(tan5 tan25 tan45 tan(90-25) tan(90-5))

= (sin20/ sin20) + (cos55 cosec35)/ (tan5 tan25 tan45 cot25 cot5)

= 1+ (cos55 cosec35)/(1)

= 1+ (cos55/sin35)

= 1+(sin(90-35)/sin35)

= 1+(sin35/sin35)

= 1+1

= 2

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