Question

Find the value of :(i) Find the value of : sin245degree + 2 cos2 60degree –2 tan2 45degree
(ii) Evaluate: cot 89degree tan 1degree + cos20degree sin 70degree
(iii) If tanθ = 8/15 find sinθ.

Answer 1

Step-by-step explanation:

(i) Sin²45°+2Cos²60- 2Tan²45

》(1\root2)²+2×(1/2)²-2×1

》1\2+2/4-2

》1/2+1/2-2

》2/2-2

》1-2

》-1(Ans)

(ii) could not found(pls check the question is it right or wrong)

(iii)Given,tan theta =8/15

AB²+BC²=AC²

》8²+15²=AC²

》64+225=AC²

》ROOT 289=AC²

》17=AC

THEREFORE Sin theta =AB/BC

》Sin theta=8/17(Ans)