Question

If Sin 30° 36' = 0.6239 and tan 12° 12' = 0.2162, then find the value of cos 51° 24' + cot 77° 48'.​

Answer 1

Answer:

cos(20°+θ)=sin30°

⇒cos(20°+θ)=cos(90°−30°)

⇒20°+θ=60°

⇒θ=40°

Hence, the answer is 40°.