Question

sin90cos0+sin88cos2+sin86cos4+...... +sin0cos90. Is equal to?? Pls tell fast​

Answer 1

Step-by-step explanation:

sin90cos0+sin88cos2+sin86cos4+.... +sin0cos90

cos(90-0)cos0 + cos(90-88)cos2 + (90-86)cos4 + .... cos90cos90

cos²0+cos²2+cos²4+...cos²90

Answer 2

Answer:23

Step-by-step explanation:

Sin90cos0+sin88cos2+sin86cos4+...+sin0cos90=

Sin90cos0+sin0cos90=1

Sin88cos2+sin2cos88=1

...

Sin46cos44+sin44cos46=1

1+1+1...+1=1×23=23